placenta

Organ of metabolic interchange between fetus and mother, partly of embryonic origin and partly of maternal origin[GO]. The fetal portion of the placenta is known as the villous chorion. The maternal portion is known as the decidua basalis. The two portions are held together by anchoring villi that are anchored to the decidua basalis by the cytotrophoblastic shell. Every claim on this page comes from the Leumas anatomy graph and carries its source.

What the placenta is

Organ of metabolic interchange between fetus and mother, partly of embryonic origin and partly of maternal origin[GO]. The fetal portion of the placenta is known as the villous chorion. The maternal portion is known as the decidua basalis. The two portions are held together by anchoring villi that are anchored to the decidua basalis by the cytotrophoblastic shell. The atlas records it as a organ at the organ scale in the human body.

Where the placenta is

It sits within the reproductive system. Only the system is known. The position shown carries almost no spatial information.

What the placenta connects to

The atlas records 11 typed relationships for it, across 6 kinds of connection. part of female reproductive system and reproductive system.

Supply and innervation

This dataset asserts no arterial supply, venous drainage or innervation for the placenta. Only a minority of structures carry those edges here, so an empty answer means nothing has been recorded — not that there is nothing to record.

Also called

Also recorded as allantoic placenta and eutherian placenta. Searching any of those names reaches this page.

Source

Uberon multi-species anatomy ontology (Mungall et al.), CC BY 4.0. Term UBERON:0001987, version 2026-06-19, retrieved 2026-08-24. Licence: CC-BY-4.0.

• Part of: female reproductive system and reproductive system.
• A kind of: anatomical structure and organ.
• contains: decidua, placenta blood vessel and placental disc.
• Develops from: chorion membrane and uterus.
• contributes to morphology of: decidua.
• connects: umbilical cord.

Questions

Where is the placenta?

It sits within the reproductive system. Only the system is known. The position shown carries almost no spatial information.

What does the placenta connect to?

Part of: female reproductive system and reproductive system.

Is the placenta the same in other species?

Leumas holds the same relationship vocabulary for every species it carries, so where another dataset records this structure you can put the two side by side on /compare.