NEET PG Medical – 2012 – Question – 22
The outer layer of the blastocyst forms ?
a) Primitive streak
b) Yolk sac
c) Embryo proper
d) Trophoblast
Show Answer
Correct Answer – D
Ans. is ‘D’ i.e., Trophoblast [Ref Singh IB, Human embryology Stile p. 38]
Blastocyst possesses an inner cell mass called embryoblast which subsequently forms the embryo proper, and an outer layer of cells, or trophoblast, which helps to provide nutrition to the embryo.
