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Anatomy

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Embryology

Question
42 out of 50
 

Primordial germ cells are derivative of (LQ)



A Epiblast
B Endoderm

C Mesoderm
D Ectoderm

Ans. A

Epiblast

Pg. 13, Langman Embryology (Ed 11th), Pg. 186, Gray’s Anatomy (Ed 40th)

 Primordial germ (PGCs) cells have been isolated from the epiblast at the posterior end of primitive streak in 2nd week.

 Germ layers form in the 3rd week by the process of gastrulation.

 Hence, PGCs cannot be considered as a derivative of any embryonic germ layers.

 Though some investigators consider epiblast as primitive ectoderm, hence, ectoderm can be a choice as answer, if epiblast was not among the options.

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