Pregnancy detection: day 41

Pregnancy Detection

The following is a scan of a day 41 pregnancy. This is a cross section through the fetus. The embryo can be identified as the mass with the the heartbeat in the center. Above the embryo is the reminants of the yolk sac which is almost collapsed at this time.

Mare: Lady 4/11/06 - Day 41

Characteristics of the embryo:

Substantial amounts of fluid visible.
Allantois makes up almost all of the fluid.
Yolk sac is almost fully resorbed.
Cells from the placenta are invading the endometrium of the uterus to form the endometrial cups but are not visible on ultrasound.