ANHB1101 Lecture Notes - Lecture 42: Internal Sphincter Muscle Of Urethra, Vas Deferens, Seminal Vesicle
5 Sep 2018
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Cell remodelling = spermiogenesis (occurs at the end) - loses cytoplasm, acrosome w head cap. mitochondria (glucose as energy becomes fructose for movement). Centriole becomes agellum. everything not needed becomes residual body and is rejected. Type a stay at basement membrane, type b continues to be primary spermatocyte. Spermatogonium (stem cells) do spermatogenesis every 16days. takes 74 days to complete. Spermatogenic wave (keeps sperm count constant) - adjacent tubules at different stages of seminiferous cycle ie. spermatogenesis occurs along each tubule section in a wave. This is coordinated by the sertoli cells (in contact w developing sperm). Sertoli cells in contact through gap junctions (blood testis barrier). 2million = follicular reserve - the one"s able to be used. polar bodies due to cell remodelling process (cytoplasm etc. shifted). Puberty (just prior to ovulation) - rst meiotic division completed. Seminal emission; smooth muscle contractions of prostate, vas deferens, seminal vesicles.
