placenta

Table of Contents

Introduction References & Edit History Related Topics

Videos

How a human embryo develops into a fetus

Discover

German machine gunners occupy a trench during World War I.

Weapons of World War I

Small, white rat (genus Rattus) on a glass table. (rodent, laboratory, experiment)

Cruel and Unusual Punishments: 15 Types of Torture

Figure 13: A Maxim machine gun, belt-fed and water-cooled, operated by German infantrymen, World War I.

7 Deadliest Weapons in History

earthquake. Heavily damaged school in the town of Yingxiu after a major earthquake struck China's Sichuan Province on May 12, 2008.

The 6 Deadliest Earthquakes Since 1950

Battle of Puebla. Cinco de Mayo. General Porfirio Diaz leads Mexican cavalry to victory against the French lead by General Charles Lorencez at Puebla, Mexico April 2, 1867. Oil on canvas, 1902. May 5, 1862. General Ignacio Zaragoza

Close up of praying mantis walking on stone ground against a blurred background in Japan

6 Animals That Eat Their Mates

B-52G with cruise missiles, USAF, short range attack missiles SRAMs; guided missile

11 of the World’s Most Famous Warplanes

placenta: Related Content

Written and fact-checked by The Information Architects of Encyclopaedia Britannica

News •

Many genes in male and female placentas expressed differently • May 1, 2025, 7:37 AM ET (National Institutes of Health (NIH) (.gov))

Human placenta stress response to maternal COVID-19 infection reinforces maternal-fetal barrier • Apr. 22, 2025, 8:55 AM ET (Medical Xpress)

Evidence alcohol even prior to conception may harm your baby • Apr. 17, 2025, 1:33 AM ET (News-Medical)

China snack shop offers to transform placentas into health benefit pills for women • Apr. 16, 2025, 7:13 AM ET (South China Morning Post)

Videos

How a human embryo develops into a fetus

See All Videos →

Topics

epitheliochorial placenta placental barrier chorionic placenta deciduate placenta yolk-sac placenta chorioallantoic placenta afterbirth syndesmochorial placenta nondeciduate placenta chorion

Dig Deeper: More Articles That Discuss This Topic

pregnancy: Diseases of the placenta