Spermatogonium

Infobox Anatomy
Name = Spermatogonium
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Caption = Germinal epithelium of the testicle. 1 basal lamina, 2 spermatogonia, 3 spermatocyte 1st order, 4 spermatocyte 2nd order, 5 spermatid, 6 mature spermatid, 7 Sertoli cell, 8 tight junction (blood testis barrier)

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Caption2 = Histological section through testicular parenchyma of a boar. 1 Lumen of Tubulus seminiferus contortus, 2 spermatids, 3 spermatocytes, 4 spermatogonia, 5 Sertoli cell, 6 Myofibroblasts, 7 Leydig cells, 8 capillaries
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A spermatogonium (plural: "spermatogonia") is an intermediary male gametogonium (a kind of germ cell) in the production of spermatozoa.

There are three subtypes:

*Type A(d) cells, with dark nuclei. These cells divide to produce copies of themselves, thereby ensuring a constant supply of spermatogonia to fuel spermatogenesis.

*Type A(p) cells, with pale nuclei. These cells divide by mitosis to produce Type B cells.
*Type B cells, which divide to give rise to "primary spermatocytes".

Each primary spermatocyte duplicates its DNA and subsequently undergoes meiosis I to produce two haploid secondary spermatocytes. Each of the two secondary spermatocytes further undergo meiosis II to produce two spermatids (haploid). (1 primary spermatocyte => 4 spermatids)

The spermatids then undergo spermiogenesis to produce spermatozoa.

=Additional

ource

This article includes material from [http://www.biology-online.org/ Biology Online] .