Hip Muscles

Question 1

Gluteus maximus IO Innervation

Answer 1

Origin:
* Ilium posterior to posterior gluteal line
* Dorsal surface of sacrum and coccyx
* Sacrotuberous ligament
Insertion:
* Upper fibers: Posterior part of the iliotibial tract and the tensor fascia latae muscle
* Lower fibers: Gluteal tuberosity of the proximal femur

Innervation
* Inferior gluteal nerve

Question 2

Gluteus medius IO Innervation

Answer 2

Origin:
* External surface of ilium between anterior and posterior gluteal lines
Insertion:
* Lateral surface of the greater trochanter of the femur

Innervation
* Superior gluteal nerve

Question 3

Gluteal Maximus Action

Answer 3

• Extension of femur at hip joint
• Lateral rotation of femur at hip joint
• Assists in rising from sitting position

Question 4

Gluteus minimus IO Innervation Action

Answer 4

Origin:
* External surface of ilium between anterior and inferior gluteal lines

Insertion:
* Anterolateral ridge on greater trochanter of the femur

Innervation:
Superior gluteal nerve

Action:
Abduct of femur at hip joint
Medial rotation of femur at hip joint

Question 5

Tensor fasciae latae IO Action Innervation

Answer 5

Origin:
* Lateral aspect of iliac crest between iliac tubercle and anterior superior iliac spine
Insertion:
* Iliotibial tract

Action
* Abduct of femur at hip joint
* Medial rotation of femur at hip joint
* Flexion of femur at hip joint
* Extension of leg at knee joint

Innervation
* Superior gluteal nerve

Question 6

Piriformis IO Action Innervation

Answer 6

Origin:
* Anterior surface of sacrum between anterior sacral foramina
Insertion:
* Medial side of superior border of the greater trochanter of the femur

Action
* Lateral rotation of hip when it is extended
* Abduction of hip when it is flexed

Innervation
* Posterior rami of S1 and S2 spinal nerves

Question 7

Obturator internus IO Action Innervation

Answer 7

Origin:
* Inner surface of obturator membrane
* Margin of the obturator foramen
Insertion:
* Medial surface of the greater trochanter of the femur above the trochanteric fossa

Action
* Lateral rotation hip when it is extended
* Abduction of hip when it is flexed

Innervation
* Nerve to obturator internus

Question 8

Superior gemellus IO Action Innervation

Answer 8

Origin:
* External surface of ischial spine
Insertion:
* Medial surface of the greater trochanter with the obturator internus tendon

Action
* Lateral rotation hip when it is extended
* Abduction of hip when it is flexed

Innervation
* Nerve to obturator internus

Question 9

Inferior gemellus IO Action Innervation

Answer 9

Origin:
* Upper aspect of ischial tuberosity
Insertion:
* Medial surface of the greater trochanter with the obturator internus tendon

Action
* Lateral rotation hip when it is extended
* Abduction of hip when it is flexed

Innervation
* Nerve to quadratus femoris

Question 10

Quadratus femoris IO Action Innervation

Answer 10

Origin:
* Lateral border of the ischial tuberosity
Insertion:
* Quadrate tubercle on the intertrochanteric crest of the femur

Action
* Lateral rotation hip when it is extended
* Abduction of hip when it is flexed

Innervation
* Nerve to quadratus femoris