11 - Pelvis Grays

11 - Pelvis Grays - Pelvis and Contents Reproductive Organs...

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Pelvis and Contents Reproductive Organs
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Bones of the Pelvis Pelvic / hip girdle Function: Attaches the lower limbs to spine Supports the viscera of the pelvis Transmits the weight of the upper body Contents: Paired hip bones (coxal bone) Unite with each other anteriorly and with the sacrum posteriorly Bony pelvis: Os coxae, sacrum and coccyx Use lab work to learn bony landmarks of pelvis pg 408
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Os Coxae Each pelvic bone during childhood: Ilium Superior region Ishium Posteroinferior region Pubis Anterior region pg 408, 423 pg 422
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True and False Pelves Separated by the pelvic brim False Pelvis Superior to the pelvic brim Iliac blades contains abdominal organs attachment for muscles and ligaments to body wall True Pelvis Inferior to the pelvic brim Space contains part colon rectum bladder uterus/ovaries (females) pg 408
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Pelvic Diaphragm levator ani and coccygeus muscles Supports pelvic organs Seals inferior opening of bony pelvis Lifts to help release feces during defecation pg 434
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Sexual Dimorphism Males Cavity is narrow, deep Smaller inlet and outlet Bones heavier, thicker Pubic angle more acute Ischial tuberosities longer, face more medially Coccyx less moveable, more curved Females Tilted forward Cavity is broad, shallow Pelvic inlet oval and outlet round Bones are lighter, thinner Pubic angle larger Ischial tuberosities shorter, more everted Coccyx more moveable, straighter pg 429
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Perineum Anus and external genitalia Diamond shaped Pubic symphysis anteriorly Ischial tuberosities laterally Coccyx posteriorly Females: External genitalia Anus Males: Scrotum Root of penis Anus pg 487-488
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Embryonic Development of the Sex Organs Begin at week 5 as masses of gonadal ridges Develop into the gonads Sexually indifferent! Both ducts are present in embryo, but only one develops: Male Mesonephric (Wolffian) ducts Vas deferens, epididymis Female Paramesonephric (Müllerian) ducts Uterus, oviduct, vagina
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External genitalia develops from same structures Embryonic structure Male Female Labioscrotal swelling Scrotum Labia major Urethral folds Penile Urethra Labia minor Genital tubercle Penis Clitoris www.bionalogy.com
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Descent of the Gonads Male Development: Testes partially descend at 3 months, finish at 7 months Enter the scrotum Vaginal process Outpocketing of the peritoneal cavity Eventually closes off Forms tunica vaginalis Gubernaculum Fibrous cord Extends from the testis to floor of scrotal sac Final teste descent: Shortening of gubernaculum Increase in intra-abdominal pressure Testosterone stimulation Page 283
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Descent of the Gonads Female Development Descend only into the pelvis Broad ligament blocks further descent
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11 - Pelvis Grays - Pelvis and Contents Reproductive Organs...

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