KIN 232 Lecture Notes - Lecture 5: Fibrin, Scrotum, Zona Pellucida
6 Dec 2016
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Document Summary
Male reproduction and hormonal functions: steps of spermatogenesis. Occurs in seminiferous tubules via stimulation by gonadtropic hormones, beginning around age 13 and decreasing in old age. Spermatogonia migrate along sertoli cells toward central lumen of seminiferous tubule. Meoisis: spermatogonia enlarge into primary spermatocytes and divide: secondary spermatocytes, spermatids, spermatozoa. 23 chromosomes (of 46) go to one spermatozoa so that the fetus gets one set from the father. More recent research shows males between 40-60 have trouble centrally producing luteinizing hormone and peripherally responding to luteinizing hormone. Acrosome of head contains lysosome-type enzymes to enter the ovum and fertilize it. Back and forth movements of tail provides motility (1- Hormonal influences of spermatogenesis: luteinizing hormone: anterior pituitary hormone stimulates. Seminal vesicle: mucoid material from secretory epithelial. React with cervical mucus to enhance affinity for sperm. Cause backward, peristaltic contraction of uterus and fallopian tubes to move sperm toward overies: fibrinogen, clots semen to keep it in female reproductive tract.
