Gluteal Region Myology

Question 1

Gluteus Maximus m.

Origin
Insertion
Action
Innervation
Blood Supply

Answer 1

Origin: ilium posterior to posterior gluteal line, dorsal saccrum and coccyx and sacrotuberous l.
Insertion: gluteal tuberosity and lateral tibial condyle via iliotibial tract
Action: extend thigh and assist in lateral rotation
Innervation: inferior gluteal n.
Blood Supply: inferior and superior gluteal a, perforating branch of deep femoral a.

Question 2

Gluteus Medius m.

Origin
Insertion
Action
Innervation
Blood Supply

Answer 2

Origin: ilium between anterior and posterior gluteal lines
Insertion: lateral aspect greater trochanter of femur
Action: abduct and medially rotate thigh
Innervation: superior gluteal n.
Blood Supply: superior gluteal a.

Question 3

Gluteus Minimus m.

Origin
Insertion
Action
Innervation
Blood Supply

Answer 3

Origin: ilium between anterior and inferior gluteal lines
Insertion: anterior aspect of greater trochanter of femur
Action: abduct and medially rotate thigh
Innervation: superior gluteal n.
Blood Supply: superior gluteal a.

Question 4

Tensor Fascia Lata m.

Origin
Insertion
Action
Innervation
Blood Supply

Answer 4

Origin: anterior superior iliac spine, anterior aspect iliac crest
Insertion: iliotibial tract and lateral tibial condyle via iliotibial tract
Action: abduct, medially rotate and flex thigh, maintains extended leg
Innervation: superior gluteal n.
Blood Supply: superior gluteal a, lateral circumflex femoral a.

Question 5

Piriformis m.

Origin
Insertion
Action
Innervation
Blood Supply

Answer 5

Origin: anterior surface sacrum (S2-4), sacrotuberous l.
Insertion: superior aspect greater trochanter of femur
Action: laterally rotate extended thigh, abduct flexed thigh, stabilize femoral head in acetabelum
Innervation: nerve to the Piriformis m.
Blood Supply: superior and inferior gluteal a, internal pudendal a.

Question 6

Superior Gemellus m.

Origin
Insertion
Action
Innervation
Blood Supply

Answer 6

Origin: ischial spine
Insertion: medial aspect greater trochanter of femur
Action: laterally rotate extended thigh, abduct flexed thigh, stabilize femoral head in acetabelum
Innervation: nerve to the Obturator Internus m.
Blood Supply: inferior gluteal a.

Question 7

Inferior Gemellus m.

Origin
Insertion
Action
Innervation
Blood Supply

Answer 7

Origin: ischial tuberosity
Insertion: medial aspect greater trochanter of femur
Action: laterally rotate extended thigh, abduct flexed thigh, stabilize femoral head in acetabelum
Innervation: nerve to Quadratus Femoris m.
Blood Supply: inferior gluteal a.

Question 8

Quadratus Femoris m.

Origin
Insertion
Action
Innervation
Blood Supply

Answer 8

Origin: lateral aspect ischial tuberosity
Insertion: quadrate tubercle on intertrochanteric crest
Action: laterally rotate thigh, stabilize femoral head in acetabelum
Innervation: nerve to Quadratus femoris m. and inferior gemelus m.
Blood Supply: medial circumflex femoral a, inferior gluteal a, 1st-4th perforating a, obturator a, some superior muscular branches of popliteal a

Question 9

Obturator Externus m.

Origin
Insertion
Action
Innervation
Blood Supply

Answer 9

Origin: margin of obturator foramen and obturator membrane
Insertion: trochanteric fossa of femur
Action: laterally rotate thigh, stabilize femoral head in acetabelum
Innervation: obturator n.
Blood Supply: obturator a, medial circumflex femoral a

Question 10

Obturator Internus m.

Origin
Insertion
Action
Innervation
Blood Supply

Answer 10

Origin: pelvis surfaces of the ilium and ischium and obturator membrane
Insertion: greater trochanter of the femur
Action: laterally rotate extended thigh, abduct flexed thigh, stabilize femoral head in acetabelum
Innervation: nerve to the obturator internus m. and superior gemelus m.
Blood Supply: internal pudendal a, superior and inferior gluteal a.