Muscles of the Extremities

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Presentation transcript:

Muscles of the Extremities Justin R. Stone AH 129 Tortora: Ch 11

Muscles: Pelvic Floor and Perineum

Pubococcygeus Iliococcygeus Pelvic Floor Levator Ani Superficial Transverse Perineal Perineum Bulbospongiosus Ischiocavernosus Deep Transverse Perineal External Urethral Sphincter External Anal Sphincter

PELVIS: Pelvic Floor Levator Ani Pubococcygeus Iliococcygeus Coccygeus

PELVIS: Pelvic Floor Most important muscle of pelvic floor Levator Ani Most important muscle of pelvic floor Counters force of Valsalva Constricts/Forms Sphincters of Anus, Urethra, and Vagina N: S2-4 2 Divisions: PuboCoccygeus Iliococcygeus

PuboCoccygeus Iliococcygeus PELVIS: Pelvic Floor O/I: O: Pubis I: Coccyx, Urethra, Anal Canal, Perineal Body of the Perineum, Anococcygeal Raphe (*All Insertions are Midline) Iliococcygeus O: O: Ischial Spine I: Coccyx

Levator Ani Pubococcygeus Iliococcygeus

PELVIS: Pelvic Floor Coccygeus N: S4-5 A: O/I: O: Ischial Spine I: Sacrococcygeal Junction N: S4-5 A: Pulls coccyx anteriorly following defecation or childbirth Assists in countering force of Valsalva

Coccygeus

Muscles: Perineum

PELVIS: Pelvic Floor and Perineum Superficial Transverse Perineal Bulbospongiosus Ischiocavernosus Deep Transverse Perineal External Urethral Sphincter External Anal Sphincter

PELVIS: Perineum Superficial Transverse Perineal N: Pudendal O/I: O: Ischial Tuberosity I: Perineal Body of Perineum N: Pudendal A: Stabilizes Perineal Body of Perineum

Superficial Transverse Perineal

PELVIS: Perineum Deep Transverse Perineal N: Pudendal O/I: O: Ischial Rami I: Perineal Body of Perineum N: Pudendal A: Aids in expelling last drops of urine and semen

Deep Transverse Perineal

PELVIS: Perineum O/I: N: Pudendal A: Bulbospongiosus O: Perineal Body of Perineum I: Male: Perineal membrane of deep muscles of perineum and dorsal penis Female: Pubic arch, root of dorsal clitoris N: Pudendal A: Aids expulsion of urine and semen Assists in erection of penis/clitoris

PELVIS: Perineum O/I: N: Pudendal Ischiocavernosus O/I: O: Ischial Tuberosity O: Ischial and Pubic Rami I: Male: Corpus Cavernosum of Penis Female: Clitoris N: Pudendal A: Maintains erection of penis/clitoris

Bulbospongiosus Ischiocavernosus

Bulbospongiosus Ischiocavernosus

PELVIS: Perineum External Anal Sphincter External Urethral Sphincter O/I: O: Annococcygeal Ligament I: Perineal Body of Perineum N: Pudendal, S4 A: Maintains closure of Anal Canal and Anus External Urethral Sphincter O: Ischial and Pubic Rami I: Male: Median Raphi Female: Vaginal Wall A: Helps expel last drops of urine/semen

External Anal Sphincter External Urethral Sphincter

External Anal Sphincter External Urethral Sphincter

PELVIS: Perineum Lab: Pelvis: Perineum Color: Netter’s Flashcards

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