Pelvis II - PELVIS II: FUNCTION TABOOS (THE VISCERA)...

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PELVIS II: FUNCTION TABOOS (THE VISCERA) Defecation Urination Ejaculation Conception
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REVIEW OF PELVIS I Pelvic brim, inlet Pelvic outlet True pelvis--viscera Tilt forward
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Mid-sagital views--how the pelvic viscera work
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Defecation STRUCTURES Rectum Internal anal sphincter External anal sphincter
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Defecation FUNCTON Internal sphincter smooth muscle-- tonic tension relaxes External sphincter skeletal muscle-- conscious relaxation Lower abdominal wall contracts pressurizing celom forcing feces out from rectum, sigmoid colon, descending colon
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Urination STRUCTURES Bladder Urethra (from kidney lecture) Kidneys Ureters FUNCTION Stretch receptors in bladder signal desire to urinate Smooth muscle of bladder wall contracts and internal sphincter of urethra relaxes Abdominal muscles contract to pressurize celom and force urine out
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Ejaculation STRUCTURES Testes Vas (ductus) deferens Seminal glands (vesicles) Prostate Urethra Corpus spongiosum Bulbospongiosum m. FUNCTION Sperm mature and collect in epididymis Move through vas deferens by peristalsis of smooth muscle of wall of vas Seminal vesicles, prostrate contribute to semen Internal urethral sphinchter (at bladder wall) prevents sperm backflow into bladder Contractions of urethra move semen to penis Bulbospongiosus m. (around urethra in penis) contracts to expel semen from penis
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Epididymis Contains efferent ductules:
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Pelvis II - PELVIS II: FUNCTION TABOOS (THE VISCERA)...

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