Parliament of Canada: Senate: The Senate has 105 members, or senators, who are appointed and hold their seat until age 75, at which point they must retire. Its purpose is to consider and revise legislation (acting as a committee of “sober second thought”), investigate national issues, and provide…

Russia: Government administration under Catherine: The Senate supervised all branches of administration, regulating the orderly flow of business. The Senate was also involved—albeit indirectly—in coordination, mainly because its procurator general, Prince Aleksandr A. Vyazemsky, held the office for a quarter of a century with the full trust of the empress. At…

Paraguay: Constitutional framework: …Chamber of Deputies and the Senate. All its members are elected by popular vote for five-year terms (with the exception of former presidents, who are appointed senators for life, though they are not entitled to vote) on the same date that the presidential elections are held.

Australia: Constitutional framework: The Senate consists of 76 members; each state has 12 senators, and there are two senators each from the Australian Capital Territory and Northern Territory. Senators representing the states serve six-year terms, while territorial senators serve three-year terms. Government ministers are drawn from both the House…

Malaysia: Constitutional framework: …federal legislature, consisting of the Senate (Dewan Negara) as the upper house and the House of Representatives (Dewan Rakyat) as the lower. The paramount ruler appoints a prime minister from among the members of the House of Representatives. On the advice of the prime minister, the monarch then appoints the…

Kazakhstan: Constitutional framework: …bicameral legislature consisting of a Senate and an Assembly (Mazhilis). Working jointly, the two chambers have the authority to amend the constitution, approve the budget, ratify treaties, and declare war; each chamber also has exclusive powers. Legislators serve four-year terms. Two members of the Senate are elected from each oblast…

Egypt: Constitutional framework: The Senate was inaugurated in October 2020 after constitutional amendments passed in 2019 reestablished an upper chamber (the previously bicameral legislature became unicameral under the 2014 constitution). Senators serve five-year terms, with one-third elected by the constituency, one-third elected by proportional representation, and another one-third appointed…

Czech Republic: Constitutional framework: …for four-year terms) and a Senate (elected on a district basis for six-year terms).

Daniel Burnham: Urban planner: …Park Commission, also called the McMillan Commission (for Michigan’s U.S. Sen. James McMillan, who was chairman of the Senate Committee on the District of Columbia). Burnham invited his friend McKim and Frederick Law Olmsted, Jr. (son of the famous landscape architect with whom Burnham had worked on the fair), to…

COINTELPRO: Senate Select Committee to Study Governmental Operations with Respect to Intelligence Activities, commonly referred to as the “Church Committee,” for its chairman, Senator Frank Church of Idaho. However, millions of pages of documents remain unreleased, and many released documents are heavily censored. In its final report,…

Nicholas I: Ascent to the throne of Nicholas I: …in military formation to the Senate Square—now the Decembrist Square—in the heart of the capital. Although the rebellion had failed by nightfall, it meant that Nicholas I ascended the throne over the bodies of some of his subjects and in actual combat with the dreaded revolution.

Parliament of Canada: Speakers: …the House of Commons and Speaker of the Senate are two important figures who preside over their chambers and enforce procedure and discipline in a nonpartisan manner. The Senate Speaker is appointed by the governor general on the recommendation of the prime minister. The House Speaker was at one time…

Italy: The legislature of Italy: …Chamber of Deputies and the Senate. All members of the Chamber of Deputies (the lower house) are popularly elected via a system of proportional representation, which serves to benefit minor parties. Most members of the Senate (the higher chamber) are elected in the same manner, but the Senate also includes…

ProCon Debate: Should Packing the U.S. Supreme Court Ever Be Considered? ProCon Issue in the News: The Judicial Modernization and Transparency Act was introduced by U.S. Senator Ron Wyden (D-OR) on Sept. 25, 2024. The bill was widely seen as a court-packing scheme. It would expand the U.S. Supreme

Rome: The Capitoline: The Palazzo Senatorio (“Senate Palace”) incorporates remains of the facade of the Tabularium, a state records office constructed in 78 bce and one of the first buildings to use concrete vaulting and employ the arch with the Classical architectural orders. After a popular uprising in 1143…

Texas Rangers, American professional baseball team based in Arlington, Texas, that plays in the American League (AL). The Rangers began play in 1961 as the Washington (D.C.) Senators and have won one World Series title (2023) and three AL pennants (2010, 2011, and 2023). The Senators finished in

Minnesota Twins, American professional baseball team based in Minneapolis, Minnesota, that plays in the American League (AL). The Twins originally played in Washington, D.C. (1901–60), and were known as the Senators before relocating to Minneapolis in 1961. The franchise has won three World Series

ancient Rome: The Senate of ancient Rome: …termed “the Senate’s advice” (senatus consultum). These advisory decrees were directed to a magistrate or the Roman people. In most instances, they were either implemented by a magistrate or submitted by him to the people for enactment into law.

ancient Rome: The Senate of ancient Rome: …termed “the Senate’s advice” (senatus consultum). These advisory decrees were directed to a magistrate or the Roman people. In most instances, they were either implemented by a magistrate or submitted by him to the people for enactment into law.

epigraphy: Ancient Rome: …epigraphic texts of significance: the Senatusconsultum de Bacchanalibus, on a bronze tablet found in 1640 in Bruttium (the “toe” of Italy) and now in Vienna, is a consular edict on Senate authority, regulating Dionysiac outbursts in Italy in 186 bce; pieces of the laws Lex Acilia Repetundarum (123 bce) and…

Judaism: Jewish contributions to diffusion of folktales: So too the famous Senbād-nāmeh (“Fables of Sinbad”)—one of the sources, incidentally, of Boccaccio’s Decameron—was rendered from Arabic into Hebrew and then into Latin. The renowned romance of Barlaam and Josaphat—a Christian adaptation of tales about the Buddha—found its Jewish counterpart in a compilation titled The Prince and the…

Druid: …poets, historians, and judges (filid, senchaidi, and brithemain). Many scholars believe that the Hindu Brahman in the East and the Celtic Druid in the West were lateral survivals of an ancient Indo-European priesthood.

Hōnen: Life and teachings: In his main work, the Senchaku hongan nembutsu-shū (“Collection on the Choice of the Nembutsu of the Original Vow”), or Senchaku-shū, written in 1198, Hōnen classified all the teachings of Buddhism under two headings: Shōdō (Sacred Way) and Jōdo (Pure Land). According to him, the Buddha, confident of man’s inner…

Hōnen: Life and teachings: In his main work, the Senchaku hongan nembutsu-shū (“Collection on the Choice of the Nembutsu of the Original Vow”), or Senchaku-shū, written in 1198, Hōnen classified all the teachings of Buddhism under two headings: Shōdō (Sacred Way) and Jōdo (Pure Land). According to him, the Buddha, confident of man’s inner…

Alain Delon: title Send a Woman When the Devil Fails), and he had his first starring role in the romance Christine (1958), opposite Romy Schneider. Delon quickly won international attention in Plein soleil (1960; “Bright Sun”; U.S. title Purple Noon), based on Patricia Highsmith’s 1955 novel The Talented…

Norman Jewison: …of It All (1963) and Send Me No Flowers (1964). After finagling out of the Universal deal, Jewison assumed control of Metro-Goldwyn-Mayer’s (MGM’s) The Cincinnati Kid (1965), a poker film starring Steve McQueen.

Sendai, city, Kagoshima ken (prefecture), southwestern Kyushu, Japan, on the lower Sendai River. A communications center since early historical times, it was a small castle town and naval port during the Tokugawa period (1603–1867). With the opening of the Kagoshima Line (railway) in the late 19th

Sendai, city and capital, Miyagi ken (prefecture), northern Honshu, Japan. It is situated inland of the western Pacific Ocean, the central districts lying between the Nanakita and Hirose rivers. The city is bounded to the south by the Natori River, south of which is the city of Natori; to the

Toyo Ito: …accounts, Ito’s masterpiece was the Sendai (Japan) Mediatheque (completed 2001), a multipurpose cultural centre whose design was inspired by floating seaweed. From the outside the approximately 22,000-square-metre (237,000-square-foot) transparent structure resembled a gigantic aquarium; the building’s seven floors were supported by slanting columns that looked like strands of seaweed swaying…

Sendai virus, (genus Respirovirus), infectious agent of the genus Respirovirus in the family Paramyxoviridae. Discovered in Sendai, Japan, the Sendai virus is naturally found in mice, rats, hamsters, guinea pigs, and pigs and primarily affects the respiratory system. The virus is highly contagious

Maurice Sendak was an American artist and writer best known for his illustrated children’s books. Sendak was the son of Polish immigrants and received his formal art training at the Art Students League of New York. While a student there, he drew backgrounds for All-American Comics and did window

Maurice Sendak was an American artist and writer best known for his illustrated children’s books. Sendak was the son of Polish immigrants and received his formal art training at the Art Students League of New York. While a student there, he drew backgrounds for All-American Comics and did window

Ramón José Sender was a Spanish novelist, essayist, and educator whose works deal with Spanish history and social issues. After studying at the University of Madrid, Sender became a lifelong Republican and was at one time imprisoned for political activities. In the early 1920s he served with the

Shining Path: …and his followers, known as Senderistas, sought to restore the “pure” ideology of Mao Zedong and adopted China’s Cultural Revolution as a model for their own revolutionary movement. The organization’s other models were Stalinist Russia and the Khmer Rouge regime in Cambodia. Envisioning revolution as a long

Shining Path, Peruvian revolutionary organization that endorsed Maoism and employed guerrilla tactics and violent terrorism. The Shining Path was founded in 1970 in a multiple split in the Communist Party of Peru. It took its name from the maxim of the founder of Peru’s first communist party, José

Raúl Sendic was the Uruguayan rebel leader and the founder of the leftist Tupamaro National Liberation Front (1963). Sendic’s guerrilla movement waged a relentless battle against the Uruguayan police and the army from 1967 to 1972. Sendic quit law school in the late 1950s to join the Socialist

Indonesia: Theatre and dance: The sendratari, for example, is essentially an updated form of traditional dance-drama that combines elements of local theatrical genres (including puppet theatre) with movements, staging, and costumes derived from contemporary styles; in Java, the form is associated with the Prambanan Temple.

Jean Senebier was a Swiss botanist and naturalist who demonstrated that green plants consume carbon dioxide and release oxygen under the influence of light. The son of a wealthy merchant, Senebier studied theology and was ordained a minister in 1765. In 1769 he became pastor of a church in Chancy,

Seneca, county, central New York state, U.S., lying between Cayuga Lake to the east and Seneca Lake to the west, the latter the largest and deepest of the Finger Lakes. Lowlands in the north that are forested with oak and hickory rise to a plateau region in the south that contains maple, birch, and

Seneca, North American Indians of the Iroquoian linguistic group who lived in what is now western New York state and eastern Ohio. They were the largest of the original five nations of the Iroquois (Haudenosaunee) Confederacy, in which they were represented by eight chiefs. In the autumn small

Seneca was a Roman philosopher, statesman, orator, and tragedian. He was Rome’s leading intellectual figure in the mid-1st century ce and was virtual ruler with his friends of the Roman world between 54 and 62, during the first phase of the emperor Nero’s reign. Seneca was the second son of a

Seneca Falls, village and town (township), Seneca county, west-central New York, U.S. The village lies in the Finger Lakes district on the Seneca River (connecting Seneca and Cayuga lakes), once the site of 50-foot (15-meter) falls. Hydroelectric power is generated locally, and there are important

Seneca Falls Convention, assembly held on July 19–20, 1848, in the Wesleyan Chapel in Seneca Falls, New York, that launched the women’s suffrage movement in the United States. Seneca Falls was the home of Elizabeth Cady Stanton, who, along with Lucretia Mott, conceived of and directed the

Finger Lakes: Seneca Lake is the largest (67 square miles [174 square km]) and deepest.

Lucius Annaeus Seneca was the author of a Latin work on declamation, a form of rhetorical exercise. Only about half of his book, Oratorum sententiae divisiones colores (“Sentences, Divisions, and Colors of the Orators and Rhetoricians”) survives; a 4th-century epitome preserves some of the rest,

Seneca was a Roman philosopher, statesman, orator, and tragedian. He was Rome’s leading intellectual figure in the mid-1st century ce and was virtual ruler with his friends of the Roman world between 54 and 62, during the first phase of the emperor Nero’s reign. Seneca was the second son of a

Seneca Village, a short-lived, predominantly African American 19th-century settlement in what is now the area between West 82nd and West 89th streets in Manhattan. As one of New York City’s first free Black communities, Seneca Village was home to the largest number of African American property

Seneca was a Roman philosopher, statesman, orator, and tragedian. He was Rome’s leading intellectual figure in the mid-1st century ce and was virtual ruler with his friends of the Roman world between 54 and 62, during the first phase of the emperor Nero’s reign. Seneca was the second son of a

Lucius Annaeus Seneca was the author of a Latin work on declamation, a form of rhetorical exercise. Only about half of his book, Oratorum sententiae divisiones colores (“Sentences, Divisions, and Colors of the Orators and Rhetoricians”) survives; a 4th-century epitome preserves some of the rest,

Senecan tragedy, body of nine closet dramas (i.e., plays intended to be read rather than performed), written in blank verse by the Roman Stoic philosopher Seneca in the 1st century ad. Rediscovered by Italian humanists in the mid-16th century, they became the models for the revival of tragedy on

seneschal, in medieval and early modern France, a steward or principal administrator in a royal or noble household. As time went on, the office declined in importance and was often equivalent to that of a bailiff (q.v.); the office and title persisted until the French Revolution. In Merovingian

groundsel, (genus Senecio), large genus of about 1,200 species of flowering plants in the aster family (Asteraceae) distributed throughout the world. Some species are cultivated as border plants or houseplants, and many species contain alkaloids that are poisonous to grazing animals. A diverse

groundsel: Major species: cineraria); and golden ragwort (S. aureus) are cultivated as border plants. German ivy (S. mikanoides) and florist’s cineraria (S. cruentus) are popular houseplants.

cineraria: …types: the garden species, especially dusty miller (S. cineraria); and the greenhouse varieties of S. cruentus, commonly referred to simply as cinerarias.

groundsel: Major species: mikanoides) and florist’s cineraria (S. cruentus) are popular houseplants.

groundsel: Major species: Ragwort, or tansy ragwort (S. jacobaea); cineraria, or dusty miller (S. cineraria); and golden ragwort (S. aureus) are cultivated as border plants. German ivy (S. mikanoides) and florist’s cineraria (S. cruentus) are popular houseplants.

waxplant: Major species: …and are sometimes known as wax vines. Porcelain flower (Hoya carnosa) has several cultivated varieties with white to rosy-pink flowers; one such variety, the Hindu rope vine, has twisted distorted leaves that may be variegated cream, yellow, and pink. The miniature waxplant (H. lanceolata bella) is more compact and has…

groundsel: Major species: German ivy (S. mikanoides) and florist’s cineraria (S. cruentus) are popular houseplants.

Alois Senefelder was a German inventor of lithography. The son of an actor at the Theatre Royal in Prague, Senefelder was unable to continue his studies at the University of Ingolstadt after his father’s death and thus tried to support himself as a performer and author, but without success. He

Alois Senefelder was a German inventor of lithography. The son of an actor at the Theatre Royal in Prague, Senefelder was unable to continue his studies at the University of Ingolstadt after his father’s death and thus tried to support himself as a performer and author, but without success. He

Alois Senefelder was a German inventor of lithography. The son of an actor at the Theatre Royal in Prague, Senefelder was unable to continue his studies at the University of Ingolstadt after his father’s death and thus tried to support himself as a performer and author, but without success. He

Senegal, country in western Africa. Located at the westernmost point of the continent and served by multiple air and maritime travel routes, Senegal is known as the “Gateway to Africa.” The country lies at an ecological boundary where semiarid grassland, oceanfront, and tropical rainforest

bichir: At least one species, the Senegal or gray bichir (P. senegalus), is capable of using its pectoral fins to propel itself across land for short distances—an adaptation that may have evolved to help the species move between temporary ponds that were drying up or hunt terrestrial insects.

coucal: The senegal coucal (C. senegalensis), 40 cm (16 inches) long, is brown above with black crown and white underparts. It is found in tropical Africa, as is a similar species, C. superciliosus, the white-browed coucal.

laughing dove, (Streptopelia senegalensis), bird of the pigeon family, Columbidae (order Columbiformes), a native of African and southwest Asian scrublands that has been successfully introduced into Australia. The reddish-brown bird has blue markings on its wings, a white edge on its long tail,

Sénégal River, river of western Africa, with a length of 1,020 miles (1,641 km). Its drainage basin encompasses some 174,000 square miles (450,000 square km). Two of the river’s three headstreams rise in the Fouta Djallon highlands in Guinea, after which it flows to the northwest and then to the

Sénégal River: Climate: The Sénégal valley proper receives 10 to 30 inches (250 to 760 mm) of precipitation annually, from late May to mid-October, with mean maximum temperatures of about 100 °F (low 40s C) in April, and mean minimum temperatures in the low 60s F (high 10s C)…

Wolof language: …two main variants of Wolof: Senegal Wolof, which is the standard form of the language, and Gambian Wolof, which is spoken along with Senegal Wolof by more than 160,000 people in The Gambia. Wolof is a national language of Senegal, where it is spoken by approximately 4.6 million people as…

vertically striped green-yellow-red national flag with a central green star. It has a width-to-length ratio of approximately 2 to 3.Senegal was one of the oldest French colonies in Africa, and it was a place where leading intellectuals such as Léopold Senghor hoped to combine both European and

history of Senegal, a survey of notable events and people in the history of Senegal. Located at the westernmost point of Africa along the coast of the Atlantic Ocean, the country is served by multiple air and maritime travel routes and is known as the “Gateway to Africa.” Senegal also functioned as

Senegal: Relief: …the depression known as the Senegal-Mauritanian Basin. Elevations of more than about 330 feet (100 metres) are found only on the Cape Verde Peninsula and in the southeast of the country. The country as a whole falls into three structural divisions: the Cape Verde headland, which forms the western extremity…

Abdoulaye Wade: In 1974 Wade founded the Senegalese Democratic Party (Parti Démocratique Sénégalais; PDS) as an opposition party to Pres. Léopold Senghor’s Senegalese Progressive Union (Union Progressiste Sénégalaise; UPS), which was known as the Socialist Party (Parti Socialiste; PS) after 1976. The PDS became the centre of a fledgling opposition movement in…

Senegambia, limited confederation (1982–89) of the sovereign countries of Senegal and The Gambia. The two countries reached a merger agreement in November 1981, and the Senegambia confederation came into being three months later. The terms of the agreement required Senegal and The Gambia to take

western Africa: Anglo-French competition: But the Colony of the Senegambia was not a success. Britain’s merchants were not willing to follow up its naval and military successes in this region, and French traders were allowed to creep back. The main results of Britain’s initiative were to interrupt French imperial ambitions in the Sénégal valley…

Stone Circles of Senegambia, more than 1,000 megalithic monuments found across the countries of The Gambia and Senegal in western Africa. The stone circles, which are made from pillars of carved stone that are assembled in a ring formation, are situated in a 100-km- (62-mile-) wide zone along a

Egyptian art and architecture: Innovation, decline, and revival from the New Kingdom to the Late period: The sculptures of Senenmut, steward of Hatshepsut, exemplify the development. At least 23 votive statues (some fragmentary) of this royal favorite are known, exhibiting many different forms.

old age, in human beings, the final stage of the normal life span. Definitions of old age are not consistent from the standpoints of biology, demography (conditions of mortality and morbidity), employment and retirement, and sociology. For statistical and public administrative purposes, however,

seneschal, in medieval and early modern France, a steward or principal administrator in a royal or noble household. As time went on, the office declined in importance and was often equivalent to that of a bailiff (q.v.); the office and title persisted until the French Revolution. In Merovingian

List of Children’s Games and Toys in Antiquity: Board games: A similar game, senet net hab, or senet, that was popular in Egypt had players race their counters to the other end of their rectangular boards. Ancient Egyptians also played other board games. Mehen, or the snake game, was played on a circular plate with a sectioned snakelike…

List of Children’s Games and Toys in Antiquity: Board games: A similar game, senet net hab, or senet, that was popular in Egypt had players race their counters to the other end of their rectangular boards. Ancient Egyptians also played other board games. Mehen, or the snake game, was played on a circular plate with a sectioned snakelike…

Ludwig Senfl was a Swiss composer, considered the most important German-speaking master of his time. Senfl probably grew up in Zürich, and at about age 10 he joined Holy Roman Emperor Maximilian I’s Hofkapelle choir. He is thought to have entered the priesthood after his voice changed, an option

Arishima Takeo: In 1922 Arishima published Sengen hitotsu (“A Manifesto”), in which he expressed his despairing conviction that only the labouring classes could help themselves and that there was nothing he, as a member of the upper classes, could do for them. That year he distributed his land and farms in…

Fujinomiya: It developed around the Sengen (Asama) Shrine, the main Shintō shrine for the worship of Mount Fuji since the 9th century. During the early part of the Edo (Tokugawa) period (1603–1867), the shogun (military ruler) Tokugawa Ieyasu built an inner shrine, a hall of worship, and a main torii…

Indus River, great trans-Himalayan river of South Asia. It is one of the longest rivers in the world, with a length of some 2,000 miles (3,200 km). Its total drainage area is about 450,000 square miles (1,165,000 square km), of which 175,000 square miles (453,000 square km) lie in the ranges and

China: The Nian Rebellion: …pacification was launched by General Senggelinqin, who led a powerful cavalry into the affected area in 1862, but his pursuit was ineffective, and the general himself was killed in Shandong in May 1865. Thus, the last imperial crack unit disappeared. Zeng Guofan succeeded Senggelinqin as general and enforced a policy…

Léopold Senghor was a poet, teacher, and statesman, the first president of Senegal, and a major proponent of the concept of Negritude. Senghor was the son of a prosperous Serer planter and trader. His mother was a Roman Catholic and sent him to a nearby Catholic mission and seminary in order to

Léopold Senghor was a poet, teacher, and statesman, the first president of Senegal, and a major proponent of the concept of Negritude. Senghor was the son of a prosperous Serer planter and trader. His mother was a Roman Catholic and sent him to a nearby Catholic mission and seminary in order to

elephant shrew, (order Macroscelidea), any of approximately 20 species of rat-sized African mammals named for their long, tapered, and flexible snout (proboscis). All have slim bodies, slender limbs, and very long hind legs and feet. Although they resemble shrews, they are not insectivores but

Senglea: …by the Knights’ grand master Claude de la Sengle. Subsequently fortified, it played an important role during the Turks’ Great Siege of Malta in 1565, when it suffered heavy damage. At that time, Sengle’s successor and the leader of Malta’s defense, Grand Master Jean Parisot de la Valette, bestowed upon…

Senglea, town, one of the Three Cities (the others being Cospicua and Vittoriosa) of eastern Malta. Senglea lies on a small, narrow peninsula between French Creek to the west and Dockyard Creek to the east, just south of Valletta across Grand Harbour. In 1552 a fort was built on the peninsula,

Japan: The Oda regime: In the 1550–60 period the Sengoku daimyo, who had survived the wars of the previous 100 years, moved into an even fiercer stage of mutual conflict. These powerful daimyo were harassed not only by each other but also by the rise of common people within their domains. The daimyo sought…

Japan: The emergence of new forces.: …lords, it is called the Sengoku (“Warring States”) period, named for a somewhat similar period in ancient Chinese history.

Patagonia: Drainage and soils: origin (the Colorado, Negro, Chubut, Senguerr, Chico, and Santa Cruz rivers). Most of the valleys either have intermittent streams—such as the Shehuen, Coig, and Gallegos rivers, which have their sources east of the Andes—or contain streams like the Deseado River, which completely dry up along all or part of their…

Buddhism: Madhyamika (Sanlun/Sanron): …result of the teachings of Sengzhao, Kumarajiva’s disciple, and later of Jizang. Both of these Chinese Madhyamika masters commented on Nagarjuna’s thesis in numerous influential works.

Senigallia, town and episcopal see, Marche regione, central Italy. Senigallia lies along the Adriatic Sea at the mouth of the Misa River. Founded by the Senonian Gauls in the 6th century bc, it became the Roman colony of Sena Gallica in 289 bc. In the 6th century it was one of the five cities of

Plateau Indian: Language: and include the Okanagan, Sinkaietk, Lake, Wenatchee, Sanpoil, Nespelim, Spokan, Kalispel, Pend d’Oreille, Coeur d’Alene, and Flathead peoples. Some early works incorrectly denote all Salishan groups as

mental disorder: Senile and presenile dementia: In these dementias there is a progressive intellectual impairment that proceeds to lethargy, inactivity, and gross physical deterioration and eventually to death within a few years. Presenile dementias are arbitrarily defined as those that begin in persons under age 65. In…

mental disorder: Senile and presenile dementia: In these dementias there is a progressive intellectual impairment that proceeds to lethargy, inactivity, and gross physical deterioration and eventually to death within a few years. Presenile dementias are arbitrarily defined as those that begin in persons under age 65. In…

keratosis: Senile keratosis is a condition marked by sharply outlined, gray to grayish black, slightly elevated flat papules, which are generally associated with aging and exposure to sunlight. They are more frequent in sunny climates and occur on exposed areas of the body—unless ingestion of arsenic…

Alzheimer disease: Neuritic plaques and neurofibrillary tangles: The presence of neuritic plaques and neurofibrillary tangles in the brain are used to diagnose Alzheimer disease in autopsy. Neuritic plaques—also called senile, dendritic, or amyloid plaques—consist of deteriorating neuronal material surrounding deposits of a sticky protein called amyloid beta