Muscles of Pelvic Walls and Floor Flashcards
0
Q
coccygeous
A
O: ischial spine
I: inf end of sacrum
N: S4, S5
A: flexes coccyx, supports pelvic viscera
1
Q
levator ani
A
O: body of pubis, tendinous arch of levator ani, ischial spine
I: perineal body, coccyx, anococcygeal ligament, walls of
prostate/vagina, rectum, anal canal
N: nerve to levator ani (S4), inf rectal nerve, coccygeal plexus
A: support pelvic viscera
resists increases in intra-abdominal pressure
2
Q
obturator internus
A
O: pelvic surface of ilium and ischium, obturator membrane
I: greater trochanter of femur
N: nerve to obturator internus (L5,S1,S2)
A: rotates thigh laterally
assists in holding femur in acetabulum
3
Q
piriformis
A
O: pelvic surface of 2-4 sacral ligaments, sup margin of greater sciatic notch, sacrotuberous ligaments I: greater trochanter of femur N: ant rami S1, S2 A: abducts and rotates thigh laterally holds femur in acetabulum
