Muscles of Pelvic Wall and Floor Flashcards
Coccygeus (ishiococcygeus)
Origin: Ischial spine
Insertion: Inferior end of sacrum
Insertion: branches of S4 and S5
Levator Ani (pubo/ilio)
Origin: Body of pubis, tendinous arch of levator ani, ischial spine
Insertion: Perineal body, coccyx, anococcygeal ligament, walls of prostate or vagina, rectum, anal canal
Innervation: Nerve to levator ani (branches of S4), inferior anal (rectal nerve) coccygeal plexus
Obturator Internus
Origin: Pelvic surface of ilium and ischium, obturator membrane
Insertion: Greater trochanter of femur
Innervation: Nerve to Obturator internus (L5-S2)
Piriformis
Origin: Pelvic surface of 2nd-4th sacral segments; superior margin of greater sciatic notch and sacrotuberous ligament
Insertion: Greater trochanter of femur
Innervation: Anterior rami of S1,2