Implantation - Implantation: when blastocyst reaches...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Implantation : when blastocyst reaches uterus, it floats in uterus for several days, receiving nourishment from uterine secretions… 6-7 days later, implantation begins o when mucosa of endometrium is ready, the blastocyst implants trophoblast creating thick lining into which blastocyst burrows o trophoblast forms 2 layers at point of contact with endometrium cytotrophoblast : inner layer syncytiotrophoblast : outer layer that loses cell boundaries as it invades endometrium o implantation takes about a week… by this time, menstruation would normally occur trophoblast cells begin secreting human chorionic gonadotropin (hCG) , which prompts the corpus luteum to continue secretion of progesterone , bypassing normal controls & menses - Placentation : placenta o Trophoblast gives rise to chorion which begins formation of placenta, with chorionic villi
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 2

Implantation - Implantation: when blastocyst reaches...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online