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Anatomy

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Embryology

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Primary cell from which sperms are derived is (PGI – 2009)



A Spermatogonia

B Spermatid

C Primary spermatocytes

D Secondary spermatocytes

Ans. A

Spermatogonia

Pg. 27, Langman embryology (Ed 11th)

 A spermatogonium (plural: spermatogonia) is an intermediary male gametogonium (a kind of germ cell) in the production of spermatozoa. They are themselves derived from primordial germ cells.

 These germ cells can be divided into Type A, In (intermediate), and Type B Spermatogonia. Included in the Type Aspermatogonia are a subset of cells from which all germ cells are derived; the spermatogonial stem cells.

 Spermatogonia are the primitive differentiated male germ cells which give rise to primary spermatocytes, through the first meiotic division.

 Primary spermatocytes are diploid cells which divide by meiosis to produce secondary spermatocytes (haploid).

Secondary spermatocytes undergo a second round of meiosis to produce the haploid round spermatids and finally mature sperms.

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