Dontneed toknowthis

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Unformatted text preview: he penis erect; also with clitoris (1) Corpora spongiosum: spongy body: Mass of spongy tissue which surrounds the urethra in the penis.... near the bottom Shaft (body) corona (rim) frenulum: underside skin connecting the glans to the shaft; highly sensitive pic on page 13 of doc Scrotum contains tunica dartos which contracts, pulling the testes up when they are too cold pic on page 13 of doc 2 (2) Crura: extend from the root; engorge with blood and connect to the pubic bones... dont need to know this (1) Urethra: Tube through which urine passes through from the bladder; sperm (1) Bladder: ... (1) Perineum: Area between the scrotum and anus, area between vagina and anus (1) Spermatic cord: Cord going from the testicles into the body, contains arteries, nerve endings, vas deferens, etc. (2) Ejaculatory duct: Located within the prostate gland, opening into the urethra Wolffian System ­ Male internal reproductive organs (vas deferens, etc.). Develops from the Mullerian system (women’s internal reproductive organs) with the help of testosterone (produced from interstitial/Leydig cells of testes) Wolffian duct develops into vas deferens Mullerian Inhibiting Substance (MIS): produced by the Sertoli cells in testes for males to get rid of female internal structures (Mullerian system) and create male ones (Wolffian system) Mullerian duct develops into fallopian tube Indifferent gonad ­ A gonad in an embryo that has not differentiated into a definitive testis or ovary. (2) Men have ‘nipoles’ because they lack estrogen (proof that men came from women) Circumcision reduces likelihood of getting STDs; reduces smegma which would accumulate under the prepuce (hood) and 55.9% of newborn boys get this procedure done (2009) A baby’s sex is determined at the time of conception. When the baby is conceived, a chromosome from the sperm cell, either X or Y, fuses with the X chromosome in the egg cell, determining whether the baby will be female or male. The (XX) chromosome means the baby will be a girl, and (XY) means it will be a boy. Women: XX Men: XY ● Genetic Stuff ○ X chromosome contains about 5,000 genes ○ The y chromosome contains about 30 genes 3 Fraternal: • Come from 2 eggs being released from ovaries, and both getting fertilized by different sperm. Both succeed in moving to uterus, implant successfully, and fully grow. Twins can be brother & sisters. No more like than any other brother sister­­but maybe similar due to similar environment Identical Twins • One sperm gets fertilized by one egg, sometime after genetic material of mother and father combined, the egg splits into 2 identical entities. Both survive ­­> identical twins. • Sons get 16% more genes from mother than father men are most like mothers Men (sperm) determine sex FEMALE Sexual Structures and Hormones (2) Ovaries: Found in pairs, alternate in producing eggs each month. Produce estrogen and progesterone (ovaries equivalent to testis) corpus luteum produces progesterone? yes. (2) Fallopian tubes: Connects the ovaries to the uterus, passage the egg travels through; fertilization occurs here for conception (2) Fimbriae: Fringe tissue around the fallopian tubes, closer to the ovaries. Main functi...
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