Muscles of the Extremities

Justin R. StoneAH 129Tortora: Ch 11

Muscles of the Extremities1Muscles:Pelvic Floor and Perineum2Pelvic FloorLevator AniPubococcygeusIliococcygeusSuperficial Transverse PerinealPerineumBulbospongiosusIschiocavernosusDeep Transverse PerinealExternal Urethral SphincterExternal Anal Sphincter

3PELVIS:Pelvic FloorLevator AniPubococcygeusIliococcygeusCoccygeus

4PELVIS:Pelvic FloorLevator AniMost important muscle of pelvic floorCounters force of ValsalvaConstricts/Forms Sphincters of Anus, Urethra, and VaginaN: S2-42 Divisions:PuboCoccygeusIliococcygeus5PELVIS:Pelvic FloorPuboCoccygeusO/I:O: PubisI: Coccyx, Urethra, Anal Canal, Perineal Body of the Perineum, Anococcygeal Raphe (*All Insertions are Midline)IliococcygeusO:O: Ischial SpineI: Coccyx6

Levator AniPubococcygeusIliococcygeus7

8PELVIS:Pelvic FloorCoccygeusO/I: O: Ischial SpineI: Sacrococcygeal JunctionN: S4-5A: Pulls coccyx anteriorly following defecation or childbirthAssists in countering force of Valsalva9

Coccygeus10Muscles:Perineum11PELVIS:Pelvic Floor and PerineumSuperficial Transverse PerinealBulbospongiosusIschiocavernosusDeep Transverse PerinealExternal Urethral SphincterExternal Anal Sphincter

12PELVIS:PerineumSuperficial Transverse PerinealO/I: O: Ischial TuberosityI: Perineal Body of PerineumN: PudendalA: Stabilizes Perineal Body of Perineum13

Superficial Transverse Perineal14PELVIS:PerineumDeep Transverse PerinealO/I: O: Ischial RamiI: Perineal Body of PerineumN: PudendalA: Aids in expelling last drops of urine and semen15

Deep Transverse Perineal16PELVIS:PerineumBulbospongiosusO/I: O: Perineal Body of PerineumI:Male: Perineal membrane of deep muscles of perineum and dorsal penisFemale: Pubic arch, root of dorsal clitorisN: PudendalA: Aids expulsion of urine and semenAssists in erection of penis/clitoris

17PELVIS:PerineumIschiocavernosusO/I: O: Ischial TuberosityO: Ischial and Pubic RamiI:Male: Corpus Cavernosum of PenisFemale: ClitorisN: PudendalA: Maintains erection of penis/clitoris

18

BulbospongiosusIschiocavernosus19

BulbospongiosusIschiocavernosus20

21PELVIS:PerineumExternal Anal SphincterO/I: O: Annococcygeal LigamentI: Perineal Body of PerineumN: Pudendal, S4A: Maintains closure of Anal Canal and Anus

External Urethral SphincterO/I: O: Ischial and Pubic RamiI: Male: Median RaphiFemale: Vaginal WallN: Pudendal, S4A: Helps expel last drops of urine/semen22

External Anal SphincterExternal Urethral Sphincter23

External Anal SphincterExternal Urethral Sphincter24PELVIS: PerineumLab: Pelvis: PerineumColor: NettersFlashcards25