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primary male sex hormone, stimulates development of primary sexual characteristics and secondary sexual characteristics

primary sexual characteristics

testes, scrotum, penis, vas deferens, glands, etc.

secondary sexual characteristics

deeper voice, enlarged thyroid cartilage, high hair chest, legs, arm, facial hair. high muscle mass, high height (skeletal growth), baldness.


gonads. produce sex hormones, estrogens, progesterone, produce sex cells oocytes


production of oocytes, begins in fetal development, in utero.


stem cells, rapid cell division, oogonia becomes primary oocytes

primary oocyte

surrounded by a layer of cells (granulosa cells). primordial follicle. all primary oocytes enters meiosis I and stall. then birth of girl.


2 million primary oocyte



menstrual cycle

starts at puberty. 28 days, regulated by hormones. at beginning of each cycle a few primary oocytes continue to develop, usually only one finishes meiosis I. and becomes secondary oocyte and first polar body.

secondary oocyte

in mature follicle. stalls midway of meiosis II. contains zona pellucida, corona radiata which protect it. is released from mature follicle at ovulation.

zona pellucida


corona radiata

several layers of granulosa cells.

after ovulation

oocyte is viable for 12-24 hours if no sperm present. ruptured follicle converts into corpus luteum.

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