Seminiferous tubules Anhui Medical University Proliferation and differentiation of Spermatogonium Ad spermatogonia (stem cell) Ap spermatogonia Ap spermatogonia Ap spermatogonia Ap spermatogonia ⊙ooooooooooooo⊙@ B spermatogonia Primary spermatocytes
Anhui Medical University Anhui Medical University Proliferation and differentiation of Spermatogonium Seminiferous tubules (stem cell)
Anhui Medical University 2)Primary spermatocyte The primary spermatocyte has 46 (44+XY)chromosomes and 4n amount of DNA soon after their formation,these cells enter the prophase of the first meiotic divition.Since the prophase of this division takes about 22 days,the majority of spermatocytes seen in sections will be in this phase.From this first meiotic division Sperm Spermatid arise smaller cells called Intercellular cytoplas- secondary spermatocytes. Supporting mic bridge cell Secondary spermatocvtes Primary sper- Structure round matocytes cell,become largest,18 Spermato- gonium micrometer.large and round nucleus Leydig cell Myoid cell Basement mem- Capillary brane
Anhui Medical University Anhui Medical University 2) Primary spermatocyte The primary spermatocyte has 46 (44+XY) chromosomes and 4n amount of DNA soon after their formation, these cells enter the prophase of the first meiotic divition. Since the prophase of this division takes about 22 days, the majority of spermatocytes seen in sections will be in this phase. From this first meiotic division arise smaller cells called secondary spermatocytes. Structure ： round cell, become largest, 18 micrometer. large and round nucleus