Amniotic membrane

Case contributed by Dr Matt A. Morgan

Presentation

Normal first trimester fetal ultrasound corresponding to 8 weeks 5 days

Annotated image

The blue arrows point to a curvilinear echogenic membrane within the gravid uterus. This is the amnion / amniotic membrane. The chorionic membrane is outside the amniotic membrane, out at the edge of the anechoic gestational sac and not visible.

Note how the yolk sac is always outside the amniotic sac.

Case Discussion

Single ultrasound image of a first trimester fetus to illustrate the amniotic membrane and its relationship to the fetus, yolk sac, and chorionic sac.

PlayAdd to Share

Case information

rID: 37555
Case created: 12th Jun 2015
Last edited: 4th Aug 2017
System: Obstetrics
Inclusion in quiz mode: Excluded
Institution: University of Pennsylvania

Updating… Please wait.
Loadinganimation

Alert accept

Error Unable to process the form. Check for errors and try again.

Alert accept Thank you for updating your details.