placenta-6 week old pregnancy

Question 1

what is seen on the slide?

Answer 1

chorionic villi of fetal part of the placenta

Question 2

what do the villi consist of?

Answer 2

connective tissue core

Question 3

where does the connective tissue core arise from?

Answer 3

from the extraembryonic mesenchyme in which the fetal blood vessels are seen

Question 4

what does the core contain?

Answer 4

fibroblasts,pagocytics cells (hofbauer cells), plasma cells and fine collagen

Question 5

whats in the fetal blood vessels?

Answer 5

nucleated red blood cells

Question 6

what covers the inner and outer layers of the villi? and what supports the layers

Answer 6

• inner =cytotrophoblast
• outer = syncytiotrophoblastic
• basment membrane

Question 7

how is the outer layer formed?

Answer 7

by the fusion of the proliferating cytotrophoblast cells

Question 8

what does the syncytial cytoplasm display and how does it stain?

Answer 8

displays a brush border on the surface and is very basophilic

Question 9

what forms the cytotrophoblastic layer?

Answer 9

continuous layer of cuboidal shaped cells, pale stained