
Seminiferous tubules - convoluted portion
Spermatogenesis has four phases: spermatocytogenesis (mitotic division of spermatogonia to primary spermatocytes); meiosis (a two-step division of primary spermatocytes to secondary spermatocytes to spermatids); spermiogenesis (cytodifferentiation of spermatids into mature spermatozoa); and spermiation (the release of sperm from Sertoli cells). 600X

Spermatogonia
Spermatogenesis has four phases: spermatocytogenesis (mitotic division of spermatogonia to primary spermatocytes); meiosis (a two-step division of primary spermatocytes to secondary spermatocytes to spermatids); spermiogenesis (cytodifferentiation of spermatids into mature spermatozoa); and spermiation (the release of sperm from Sertoli cells). 600X

Primary spermatocytes
Spermatogenesis has four phases: spermatocytogenesis (mitotic division of spermatogonia to primary spermatocytes); meiosis (a two-step division of primary spermatocytes to secondary spermatocytes to spermatids); spermiogenesis (cytodifferentiation of spermatids into mature spermatozoa); and spermiation (the release of sperm from Sertoli cells). 600X

Spermatids (early)
Spermatogenesis has four phases: spermatocytogenesis (mitotic division of spermatogonia to primary spermatocytes); meiosis (a two-step division of primary spermatocytes to secondary spermatocytes to spermatids); spermiogenesis (cytodifferentiation of spermatids into mature spermatozoa); and spermiation (the release of sperm from Sertoli cells). 600X

Spermatids (late)
Spermatogenesis has four phases: spermatocytogenesis (mitotic division of spermatogonia to primary spermatocytes); meiosis (a two-step division of primary spermatocytes to secondary spermatocytes to spermatids); spermiogenesis (cytodifferentiation of spermatids into mature spermatozoa); and spermiation (the release of sperm from Sertoli cells). 600X

Spermatozoa
Spermatogenesis has four phases: spermatocytogenesis (mitotic division of spermatogonia to primary spermatocytes); meiosis (a two-step division of primary spermatocytes to secondary spermatocytes to spermatids); spermiogenesis (cytodifferentiation of spermatids into mature spermatozoa); and spermiation (the release of sperm from Sertoli cells). 600X

- Flagella
Spermatogenesis has four phases: spermatocytogenesis (mitotic division of spermatogonia to primary spermatocytes); meiosis (a two-step division of primary spermatocytes to secondary spermatocytes to spermatids); spermiogenesis (cytodifferentiation of spermatids into mature spermatozoa); and spermiation (the release of sperm from Sertoli cells). 600X

Sertoli cells
Spermatogenesis has four phases: spermatocytogenesis (mitotic division of spermatogonia to primary spermatocytes); meiosis (a two-step division of primary spermatocytes to secondary spermatocytes to spermatids); spermiogenesis (cytodifferentiation of spermatids into mature spermatozoa); and spermiation (the release of sperm from Sertoli cells). 600X

Image source >
Image taken of a slide in the University of New England College of Osteopathic Medicine collection.