Musculature of Glutes and Intrinsic Hip

Question 1

Tensor Fascia Latae

Answer 1

O: ASIS; ant. part of iliac crest, iliac tubercle, deep surface of fascia lata

I: IT tract of fascia lata

A: flexion, int. rot, and A24 thigh; tenses fascia lata

N: superior gluteal nerve (L4-S1)

Question 2

Gluteus Maximus

Answer 2

O: ext. surface-ala of ilium- post. to post. gluteal line, iliac crest, dorsal surface of sacrum, coccyx, and sacrotuberous ligament

I: IT tract; some on gluteal tuberosity of femur

A: extends thigh; assists ext. rotation; steadies thigh flexion; extends pelvis when thigh fixed

N: inf. gluteal nerve (L5-S2)

Question 3

Gluteus Medius

Answer 3

O: ext. surface of ilium; between ant. and post. gluteal lines

I: lat. surface of greater trochanter of femur

A: A24 of thigh; int. rotation of thigh (ant fibers), ext. rotation (post fibers), steadies pelvis to same side during locomotion

N; sup. gluteal nerve (L4-S1)

Question 4

Gluteus Minimus

Answer 4

O: ext. surface of ilium; between ant. and inf. gluteal lines

I: ant. surface of greater trochanter of femur

A: A24 and int. rotation of thigh; steadies pelvis

N: sup. gluteal nerve (L4-S1)

Question 5

Piriformis

Answer 5

O: ant. surface of sacrum, sup margin of greater sciatic notch and sacrotuberous ligament

I: sup. border of the greater trochanter

A: ext. rotation when thigh ext, A24 when thigh flexed; holds head of femur into acetabulum

N: dorsal division branches of ventral rami of S1 and S2

Question 6

Obturator Internus

Answer 6

O: pelvic surfaces of ilium and ischium; int. surface of obturator membrane

I: med. surface of greater trochanter of femur

A: ext. rotation when thigh ext; A24 flexed thigh; holds head of femur in acetabulum

N: nerve to obturator internus (ventral divisions of L5-S1)

Question 7

Obturator Externus

Answer 7

O: rami of pubis and ischium; ext. surface of obturator membrane

I: trochanteric fossa of femur

A: ext. rotation of ext. thigh

N: obturator nerve(L3, L4)

Question 8

Gemellus Superior

Answer 8

O: ischial spine

I: med. surface of greater trochanter of femur

A: ext. rotation of ext. thigh

N: nerve to obturator internus

Question 9

Gemellus Inferior

Answer 9

O: ischial tuberosity

I: med. surface of greater trochanter of femur

A: ext. rotation of ext. thigh

N: nerve to quadratus femoris

Question 10

Quadratus Femoris

Answer 10

O: lat. border of ischial tuberosity; inf. to inf glamelli

I: quadrate tubercle on intertrochanteric crest and inf. to it

A: ext. rotates thigh and steadies femoral head in acetabulum

N: nerve to quadratus femoris (ventral divisions of L5-S1)