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Reproduction and Pregnancy Review
Terms in this set (7)
1.) Spermatocytogenesis- Diploid Spermatagonium divides mitotically into 2 diploid primary spermatocytes, which each divide using meiosis to 2 haploid secondary spermatocytes
2.) Spermatidogenesis- Secondary spermatocytes produced earlier rapidly enter meiosis II and divide to produce haploid spermatids (Too fast and rarely seen histologically)
3.) Spermiogenesis- spermatids are transformed into mature sperm (spermatozoa) through loss of cytoplasm and development of flagella
Occurs in seminiferous tubules. Diploid spermatogonia start near basement membrane of tubule. Spermatocytes move toward lumen where mature spermatozoa are released.
Capacitation- When, where, why?
Occurs within sperm after ejaculation in the female reproductive tract when sperm interacts with ZP3 protein on Zona Pellucida of ovum. Inhibitory factors and cholesterol are removed from sperm membrane which leads to increased Ca+ permeability (increased motility of sperm). Also surface proteins get redistributed, resulting in acrosome reaction where acrosomal membrane fuses with outer sperm membrane creating pores and allowing the hydrolytic and proteolytic enzymes to escape and penetrate the ZP of ovum. Result if fertility of sperm, who were infertile until capacitation (takes 4-6 hours).
What prevents multiple sperm from fertilizing ovum?
Cortical Reaction- when sperm fuses with ovum, fusion triggers Ca++ release from vesicles in the secondary oocyte -> exocytosis of proteases form cortical granules which convert zona pellucida into impenetrable barrier
What and where from are all secretions in Male Repro?
Pathway of sperm including structures passed and when sperm mature and when secretions join.
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