Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

View full-text article in PMC

. 2016 Jan 8;10(1-2):88–110. doi: 10.1080/19336918.2015.1120397

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© 2016 Taylor & Francis Group, LLC

PMC Copyright notice

Figure 1. — Human placental development. (A) Blastocyst (5° dg). (B) Implantation phase (6.5° dg). Trophectoderm differentiation and syncytiotrophoblast infiltration of the endometrium. (C) Post-implantation phase (12° dg). Syncytiotrophoblast-mediated erosion of the maternal blood vessels and endometrial glands, and formation of the primary chorionic villi from cytotrophoblasts. (D) Post-implantation phase (16° dg). Differentiation of the extraembryonic mesoderm and formation of the secondary chorionic villi. (E) Pre-placental phase (21° dg). Formation of the tertiary chorionic villi and cytotrophoblastic shell. (F) Definitive placenta (20° weeks). Evidence of the placental bed formed by the chorionic villi, decidualized endometrium and adjacent myometrium. dg = days of gestation.