30 male_2007_sm - Male Reproductive System Ma le re p ro d...

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Ma le  re pro duc tive   s ys te m Stephen Sugrue Male Reproductive System Male Reproductive System Stephen Sugrue Stephen Sugrue Nov. 14,2007 Nov. 14,2007
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Male reproductive system Male reproductive system testis epididymis vas deferens accessory sex glands seminal vesicle prostate gland bulbourethral gland
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Testes Testes Like the ovaries, the testes have two functions: they produce the male gametes (spermatozoa) and they produce male sexual hormone (testosterone) Men 20-48 produce 2.5X10 8 sperm/day From stem cell to release of sperm takes about 70 days
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tunica albuginea. mediastinum testis. delicate septa divide parenchyma into lobules.
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originate in the endoderm of yolk sac (week 4) migrate to the primordial testis differentiate into spermatogonia. always in contact with BM Primordial Germ Cells (PGCs) Primordial Germ Cells (PGCs)
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Seminiferous tubules Seminiferous tubules Each lobule contains 1-4 150-300 micrometers in diameter 30-80 cm long Enclosed in basal lamina Surrounded by 3-4 layers of smooth muscle Seminiferous epithelium Spermatogenic cells Sertoli cells
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Sertoli cells provide: Sertoli cells provide: Support for germ cells The environment for germ cells to develop and mature Substances initiating meiosis for the reduction from diploid to haploid cells Hormonal signals effecting pituitary gland control of spermatogenesis
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30 male_2007_sm - Male Reproductive System Ma le re p ro d...

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