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Blastocyst implantation, diagram

Blastocyst implantation, diagram

C009/3064

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Credit

FRANCIS LEROY, BIOCOSMOS / SCIENCE PHOTO LIBRARY FRANCIS LEROY, BIOCOSMOS / SCIENCE PHOTO LIBRARY

Caption

Blastocyst implantation. Diagram of the blastocyst (lower right), a cellular stage that occurs during human (and all mammalian) reproduction, five days after fertilisation. It is the stage between the morula and the gastrula. During this stage, implantation (upper left) takes place on the wall of the uterus (endometrium, orange). The outer trophoblast layer (light grey) implants to form the placenta (purple). The inner cell mass (darker grey) will form the embryo. At right, the chorion (red), yolk sac (right, black), amniotic cavity (left, black), amnion (left, light blue), embryonic disk (right, light blue), and blood spaces (pink) are also shown.

Release details

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