Hip External Rotation

Question 1

Gluteus Maximus

Answer 1

Origin: Posterior Ilium (Posterior to posterior gluteal line), posterior surface of Sacrum + Coccyx
Insertion: Gluteal tuberosity (below Greater Trochanter) + ITB
Innervation: Inferior Gluteal Nerve (L5, S1, S2)

Question 2

Piriformis

Answer 2

Origin: Anterior Surface of Sacrum
Insertion: Superior Aspect of Greater Trochanter
Innervation: Nerve to Piriformis, Sacral Plexus (S1, S2)

Question 3

Sartorious

Answer 3

Origin: ASIS
Insertion: Proximal medial tibia
Innervation: Femoral Nerve (L2 & L3)

Question 4

Obturator Internus

Answer 4

Origin: Posterior / internal surface of the obturator membrane / foramen.
Insertion: Posteromedial aspect of Greater Trochanter (Trochanteric Fossa)
Innervation: Obturator Nerve (L5, S1)

Question 5

Obturator Externus

Answer 5

Origin: Anterior / external surface of Obturator Membrane / foramen
Insertion: Posteromedial aspect of Greater Trochanter (Trochanteric Fossa)
Innervation: Obturator Nerve (L3, L4)

Question 6

Gemellus Superior

Answer 6

Origin: Ischial Spine (Below PIIS)
Insertion: Posteromedial aspect of Greater Trochanter (Trochanteric Fossa)
Innervation: Obturator Nerve (L5, S1, S2)

Question 7

Gemellus Inferior

Answer 7

Origin: Ischial Tuberosity
Insertion: Posteromedial aspect of Greater Trochanter (Trochanteric Fossa)
Innervation: Quadratus Femoris Nerve (L5, S1)

Question 8

Quadratus Femoris

Answer 8

Origin: Lateral Border of Ischial Tuberosity
Insertion: Quadratus Tubercle of the Intertrochanteric Crest
Innervation: Quadratus Femoris Nerve (L5, S1)