The Cavity Separating the Inner Cell Mass from the Trophoblast

Question

The cavity separating the inner cell mass from the trophoblast is the ________.
A) blastocoele
B) amniotic cavity
C) lacuna
D) epiblast
E) hypoblast

Accepted Answer

The cavity separating the inner cell mass from the trophoblast is the blastocoele. The amniotic cavity develops later, after gastrulation. The lacuna is a space within the syncytiotrophoblast where maternal blood pools. The epiblast and hypoblast are layers of cells within the inner cell mass.