Muscles of Gluteal Region 2.0

Question 0

Insertion of Piraformis

Answer 0

Superior border of greater trochanter of femur

Question 1

Origin of Piraformis

Answer 1

Anterior surface of 2nd-4th sacral segments, superior margin of greater sciatic notch and sacrotubrous ligament

Question 2

Innervation of Piraformis

Answer 2

Branches of anterior rami of S1, S2

Question 3

Action of Piraformis, Gemelli superior and inferior, and obturator internus

Answer 3

Laterally rotate extended hip joint; abduct flexed hip joint; steady femoral head in acetabulum (stabilize hip joint)

Question 4

Origin of Obturator Internus

Answer 4

Pelvic surface of ilium and ischium, obturator membrane

Question 5

Insertion of Obturator Internus

Answer 5

Medial surface of greater trochanter of femur

Question 6

Innervation of obturator internus

Answer 6

nerve to obturator internus (L5, S1)

Question 7

Origin of Gemelli superior and inferior

Answer 7

Superior- ischial spine

Inferior- Ischial tuberosity

Question 8

Insertion of Gemelli superior and inferior

Answer 8

Medial Surface of Greater trochanter of femur

Question 9

Innervation of G superior and inferior

Answer 9

Nerve to the obturator internus

Question 10

Origin of Quadratus femoris

Answer 10

Lateral border of ischial tuberosity

Question 11

Insertion of Quadratus femoris

Answer 11

Quadrate tubercle on intertrochanteric crest of femur and area inferior to it

Question 12

Innervation of Quadratus Femoris

Answer 12

Nerve to quadratus femoris (L5, S1)

Question 13

Action of Quadratus femoris

Answer 13

Laterally rotates hip, also pulls femoral head into acetabulum to stabilize hip joint