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Gross Anatomy
Muscles of the Pelvic Wall
16
Anatomy
Post-Graduate
12/08/2009

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Cards

Term
Obturator Internus Origin
Definition
Pelvic surfaces and ischium; obturator membrane
Term
Obturator Internus Insertion
Definition
Greater trochanter of femur
Term
Obturator Internus Innervation
Definition
Nerve to obturator internus L5, S1-2
Term
Obturator Internus Action
Definition
Rotates thigh laterally; assists in holding head of femur in acetabulum
Term
Piriformis Origin
Definition
Pelvic surface of 2nd to 4th sacral segments; superior margin of greater sciatic notch and sacrotuberous ligament .
Term
Piriformis Insertion
Definition
Greater trochanter of femur
Term
Piriformis Innervation
Definition
Ventral rami of S1-2
Term
Piriformis Action
Definition
Rotates thigh laterally; assists in holding head of femur in acetabulum; abducts thigh
Term
Levator Ani Origin
Definition
Body of pubis, tendinous arch or obturator fascia, and ischial spine
Term
Levator Ani Insertion
Definition
Perineal body, coccyx, anococcygeal ligament, walls of prostate or vagin, rectum, and anal canal
Term
Levator Ani Innervation
Definition
nerve to levator ani and inferior anal nerve and coccygeal plexus
Term
Levator Ani Action
Definition
Helps to support the pelvic viscera and resists increases in intra-abdominal pressure
Term
Coccygeus Origin
Definition
Ischial spine
Term
Coccygeus Insertion
Definition
inferior end of sacrum
Term
Coccygeus innervation
Definition
branches of S4-5
Term
Coccygeus Action
Definition
forms small part of pelvic diaphragm that supports pelvic viscera; flexes coccyx
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