| Implantation site, showing the relation of the ovum to the uterine tissues.
Streamers of syncytiotrophoblast extend outward into the endometrial stroma.
Beyond the tips of the streamers numerous detached or wandering syncytial
cells are visible. Beneath the ovum, in close proximity to the syncytium,
there are distended uterine glands filled with stagnant blood. Near the
lower margin of the picture a blood sinus (Bl. Sin.) is seen filled with
plasma and some loosely packed red cells. A large vesicle, presumably a
detached part of the primitive yolk sac (P.P.Y.S.), lies on the mesodermal
lining of the chorion at the side opposite the embryo. Section 135. |
|
