Spermatogonium

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Spermatogonium
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)
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
Gray's	subject #258 1243
MeSH	Spermatogonia

A spermatogonium (plural: spermatogonia) is an intermediary male gametogonium (a kind of germ cell) in the production of spermatozoa.

These germ cells can be divided into Type A, In (intermediate), and Type B Spermatogonia. Included in the Type A spermatogonia 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.

Spermatocytes are diploid cells which divide by a second round of meiosis to produce the haploid round and elongated spermatids and finally mature spermatozoa.

[edit] Additional images

Transverse section of a tubule of the testis of a rat. X 250.

Schematic diagram of Spermatocytogenesis

[edit] Source

This article includes material from Biology Online.