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Download Pelvis Muscle Table - Stritch School of Medicine
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Robert Frysztak, PhD. Structure of the Human Body Loyola University Chicago Stritch School of Medicine PELVIS MUSCLE TABLE MUSCLE PROXIMAL ATTACHMENT (ORIGIN) DISTAL ATTACHMENT (INSERTION) INNERVATION Iliacus Superior 2/3 of iliac fossa, ala of Lesser trochanter of femur and shaft Femoral nerve sacrum, anterior sacro‐iliac ligaments inferior to it, to psoas major tendon Obturator internus Pelvic surface of obturator membrane and surrounding bone Piriformis MAIN ACTIONS BLOOD SUPPLY MUSCLE GROUP Flexes thigh at hips and stabilizes hip Iliac branches of iliolumbar artery joint, acts with psoas major Anterior thigh Medial surface of greater trochanter Nerve to obturator internus of femur Laterally rotates extended thigh, abducts flexed thigh at hip Internal pudendal and obturator arteries Gluteal region Anterior surface of sacral segments 2–4, sacrotuberous ligament Superior border of greater trochanter Ventral rami of L5, S1, S2 of femur Laterally rotates extended thigh, abducts flexed thigh at hip Superior and inferior gluteal arteries, Gluteal region internal pudendal artery Coccygeus (ischiococcygeus) Ischial spine, sacrospinous ligament Inferior sacrum, coccyx Supports pelvic viscera, draws coccyx Inferior gluteal artery forward Levator ani Body of pubis, tendinous arch of obturator fascia, ischial spine Inferior gluteal artery, internal Perineal body, coccyx, anococcygeal Ventral rami of lower sacral nerves, Supports pelvic viscera, raises pelvic pudendal artery and its branches Pelvic floor raphe, walls of prostate or vagina, perineal nerve floor rectum, anal canal (inferior rectal and perineal arteries) Puborectalis Lower part of pubic symphysis, superior fascia of urogenital diaphragm Loops around rectum; no distal attachment Ventral rami of lower sacral nerves Nerve to levator ani muscle Bulbospongiosus Male: perineal membrane, corpus Male: median raphe, bulb of penis, cavernosum, bulb of penis Female: perineal body dorsum of clitoris, inferior fascia of Female : perineal body urogenital diaphragm, bulb of vestibule, pubic arch Male: compresses bulb of penis, forces blood into body of penis during erection, removes urine from Deep branch of perineal nerve from urethra and semen during ejaculation Internal pudendal artery and its Female : constricts vaginal orifice, branch (perineal artery) pudendal nerve assists in expressing secretions of greater vestibular gland, forces blood into body of clitoris Compressor urethrae (female only) Ischiopubic ramus Perineal branches of pudendal nerve Sphincter of urethra Deep transverse perineal Inner surface of inferior ischial rami External anal sphincter Anterior aspect of urethra Male: medial tendinous raphe and perineal body Female: sides of vagina Deeper fibers surround anal canal, attach posteriorly to coccyx and Tip of coccyx, anococcygeal ligament anteriorly to central point of perineum Perineal branches of pudendal nerve Stabilizes perineal body, supports prostate/vagina Perineal and inferior rectal branches Closes anal orifice of pudendal nerve Inferior rectal and transverse perineal Perineal artery Deep branch of perineal nerve from Forces blood into body of penis and Internal pudendal artery and its pudendal nerve clitoris during erection branch (perineal artery) Sphincter urethrae External fibers from junction of inferior pubic and ischial rami and adjacent fascia; internal fibers pass medially to surround membranous urethra Male: median raphe in front and behind urethra Female: encloses urethra, attaches to sides of vagina Compresses urethra at end of Perineal branches of pudendal nerve micturition; in female also compresses the distal vagina Sphincter urethrovaginalis (female only) Perineal body Passes forward and anterior around Perineal branches of pudendal nerve Sphincter of urethra and vagina urethra Central tendon (perineal body) Perineal branches of pudendal nerve Stabilizes central tendon Cremaster Lower edge of internal oblique and middle of inguinal ligament Pubic tubercle, crest of pubis Genital branch of genitofemoral nerve Retracts testicle Perineal Perineal branch of internal pudendal Perineal artery Inferior internal surface of Crus of penis or clitoris ischiopubic ramus, ischial tuberosity Ischial rami and tuberosities Pelvic floor Perineal branch of internal pudendal Perineal artery Ischiocavernosus Superficial transverse perineal Pelvic floor Perineal Perineal branch of internal pudendal Perineal artery Perineal branch of pudendal artery Perineal Perineal branch of internal pudendal Perineal artery Cremasteric branch of inferior Spermatic cord epigastric artery 07/16/2015
