Human Sexuality and Culture_5

Human Sexuality and Culture_5 - interstitial or Leydig...

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Human Sexuality and Culture Lecture 1/23/12: Erection Reflex in response to any stimulation perceived as sexual Nerve fibers swell in arteries of penis, allow blood to flood spongy bodies Penis returns to flaccid state when arteries constrict and pressure on veins is relaxed Scrotum Hangs loosely at root of the penis, holding two testicles Skin of scrotum varies in appearance under different conditions Keeps temperature fairly constant at about 93 degrees F o Cremaster muscle raises and lowers scrotum to help with temperature o Internal male anatomy Testes Gonad, an organ that produces gametes or sperm Also produces testosterone Inside: o Sperm are produced and stored in seminiferous tubules o Testosterone is synthesized in
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Unformatted text preview: interstitial or Leydig cells o Immature sperm migrate to epididyms to mature for another 10-14 days Seminal vesicles • Contribute rich secretions, merge with vas deferens into ejaculatory duct Epidyidymus Vas deferens • Carries sperm from testicles, mixes with other fluids, propels sperm toward urethra • Vasectomy – snip or cauterize vas deferens Prostate • Secretes fluid that neutralizes vaginal acidity Cowper’s glands (bulbourethral gland) • Produces fluid that cleans and lubricates urethra Ejaculation • Reflex that ejects fluids from penis • Ejaculatory pathway Semen is just 1% sperm • Seminal vesicles – 70% of volume • Prostate gland – 30% of volume...
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Human Sexuality and Culture_5 - interstitial or Leydig...

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