U3 - lateral rotaters

anterior surface of sacrum

piriformis origin

greater trochanter

piriformis, gemellus superior, obturator internus, gemellus inferior insertion

laterally rotates extended femur at hip

abducts flexed femur at hip joint

function of piriformis, gemellus superior, obturator internus, gemellus inferior

branches of spinal nerves S1, S2

innervation of piriformis

ischial spine

origin of gemellus superior

n to obturator internus

gemellus superior, obturator internus innervation

laterally rotates femur at hip joint

function of quadratus femoris, obturator externus

deep surface of obturator membrane, anterolateral wall of true pelvis, superior ramus of pubis and bone surrounding obturator femo

obturator internus origin

ischial tuberosity

gemellus inferior origin

n to quadratus femoris

gemellus inferior, quadratus femoris innervation

lateral aspect of ischium, anterior to ischial tuberosity

quadratus femoris origin

intertrochanteric crest of femur

quadratus femoris insertion

external surface of obturator foramen and obturator membrane

obturator externus origin

obturator n

obturator externus innervation

trochanteric fossa of femur

obturator externus insertion