BIOB33H3 Lecture Notes - Seminal Vesicle, Anterior Pituitary, Spermiogenesis
20 Mar 2013
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Document Summary
Essential functions in the male: spermatogenesis, delivery of sperm to female. Essential functions in the female: oogenesis, receive sperm and transport for fertilization, maintain fetus, parturition and nourishment of infant. Parts of sperm: head contains dna, acrosome has enzymes to penetrate egg, midpiece has mitochondria, tail is for movement. Control of spermatogenesis: an increase in gnrh from hypothalamus occurs at puberty, probably due to a decrease in melatonin, anterior pituitary hormones secreted (gonadotropins, luteinizing hormone (lh a. k. a. Icsh) testosterone from interstitial cells mitosis/meiosis of germ cells: follicle stimulating hormone (fsh) spermiogenesis (sperm remodeling) Begins during fetal development: arrested during meiosis, will not complete meiosis unless fertilized, lots of cytoplasm, organelles, ovarian cycle. Increase in gnrh occurs at puberty: due to decrease in melatonin and increase in % body fat. Follicular phase: lh thecal cells make androgen (dhea, fsh granulosa cells make estrogen from androgen, developing follicle makes low levels of estrogen (negative feedback)
