Lateral rotator group Flashcards
piriformis origin
- anterior surface of 2nd to 4th sacral segments
- superior margin of greater sciatic notch and sacrotuberous ligament
piriformis insertion
superior border of greater trochanter of femur
piriformis innervation
nerve to piriformis
piriformis blood supply
superior and inferior gluteal arteries
piriformis action
- laterally rotate extended thigh and abduct flexed thigh; steady femoral head in acetabulum
gemellus superior origin
Ischial spine
gemellus superior insertion
medial surface of greater trochanter of femur
gemellus superior nerve
nerve to orbturator internus
gemellus superior blood supply
inferior gluteal artery
gemellus superior action
- laterally rotate extended thigh and abduct flexed thigh
- steady femoral head in acetabulum
obturator internus origin
pelvic surface of ilium and ischium, obturator membrane
obturator internus insertion
medial surface of greater trochantor of femur
obturator internus nerve
nerve to obturator internus
obturator internus action
- laterally rotate extended thigh, and abduct flexed thigh
- steady femoral head in acetabulum
obturator internus blood supply
inferior gluteal artery
gemellus inferior origin
ischial tuberosity
gemellus inferior insertion
medial surface of greater trochanter of femur
gemellus inferior nerve
nerve to quadratus femoris
gemellus inferior action
- laterally rotate extended thigh, and abduct flexed thigh
- steady femoral head in acetabulum
gemellus inferior blood supply
inferior gluteal artery
obturator externus origin
margins of the obturator foramen and obturator membrane
obturator externus insertion
trochanteric fossa of femur
obturator externus nerve
obturator nerve
obturator externus action
laterally rotates thigh
steadies head of femur in acetabulum
