PSL201Y1 Chapter : PSL201 – Mar 11 – Endocrine 7 Overview of Reproduction and Male Reproduction.docx

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11 Apr 2012
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Psl201 mar 11 endocrine 7: overview of reproduction and male reproduction. Each parent produces gametes which contain a copy of half their gentic material. Gonadotrphins: secreted by the anterior pituitary and act on the gonads: fsh & lh. Fsh acts on sertoli cells to stimulate spermatogenesis. Lh stimulates the secretion of androgens by leydig cells. Testosterone promotes development and growth of accessory reproductive organs during puberty: less testosterone means smaller repo organs, also causes 2nd sex characteristics and promotes sex drive. 3 segments hen fully developed: bulblike head, short cylindrical midpeice lonf slender tail. Acrosome: vesicle withing the head containinf enzymnes and nutrients which allow the sperm to fuse to the egg. Spermatogenesis occurs near the basement membrane in semiferious tubules with spermatogonia. Older more mature cells are near the lumen, newer cells are near the basement membrane. Sperm are immobile at this time (for about 20 days) Aquire mobility once they move into the epididymis.

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