Which of the following statement is true regarding gastrulation?

A. Establishes all the three germ layers

B. Usually occurs at 4 weeks of gestation

C. Involves the hypoblastic cells of inner cell mass

D. Occurs at the caudal end of the embryo prior to its cephalic end

Correct Answer: Establishes all the three germ layers

Description: Gastrulation is the formation process by which the 3 germ layers and axial skeleton are established in the embryo. It is the beginning of morphogenesis. It occurs during the third week of gestation. 3 germ layers which are formed includes ectoderm, endoderm and mesoderm.Ref: The Developing Human, Keith L. Moore, 7th Edition, Page 60 ; Langman's Medical Embryology, 8th Edition, Page 61

Category: Anatomy

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