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Germinal_epithelium_testiclesvg
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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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Testicle-histology-boarjpg
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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 Cell s, 8 Capillaries
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Spermatogonia
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A05360490890900
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A (plural: ''spermatogonia'') is an intermediary male
Gametogonium (a kind of
Germ Cell ) in the production of
Spermatozoa .
There are two subtypes:
cells have dark nuclei and they divide to produce copies of themselves, thereby ensuring a constant supply of spermatogonia to fuel spermatogenesis.
cells have pale nuclei and they divide by mitosis to produce Type B cells and these Type B cells divide again 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 spermatocytes => 4 spermatids)
The spermatids then undergo
Spermiogenesis to produce
Spermatozoa .
