3. lateral rotator group

origin of piriformis

anterior surface of sacrum

insertion of piriformis

greater trochanter of femur

innervation of piriformis

branches of spinal nerve S1, S2

function of piriformis

-laterally rotates an extended femur at hip

-abducts flexed femus at hip joint

origin of gemellus superior

ischial spine

insertion of gemellus superior

greater trochanter of femur

innervation of gemellus superior

nerve to obturator internus

function of gemellus superior

-laterally rotates extended femur at hip

-abducts flexed femur at hip

origin of obturator internus

-anterolateral wall of true pelvis

-deep surface of obturator membrane

-superior ramus of pubis and bone surrounding obturator foramen

insertion of obturator internus

greater trochanter of femur

innervation of obturator internus

nerve to obturator internus

function of obturator internus

-laterally rotates extended femur at hip

-abducts flexed femur at hip

origin of gemellus inferior

ischial tuberosity

insertion of gemellus inferior

greater trochanter of femur

innervation of gemellus inferior

nerve to quadratus femoris

function of gemellus inferior

-laterally rotates extended femur at hip

-abducts flexed femus at hip

origin of quadratus femoris

lateral aspect of ischium, anterior to ischial tuberosity

insertion of quadratus femoris

intertrochanteric crest of femur

innervation of quadratus femoris

nerve to quadratus femoris

function of quadratus femoris

laterally rotates femur at hip joint

origin of obturator externus

external surface of obturator foramen and obturator membrane

insertion of obturator externus

trochanteric fossa of femur

innervation of obturator externus

obturator nerve

function of obturator externus

laterally rotates femur at hip joint