Lower Extremity- Anatomy

Question 1

Hip Flexion

List the muscles and the (innervation including root level)

Answer 1

Iliopsoas
* L2, L3, L4, femoral nerve
Sartorius
* L2, L3, L4, femoral nerve
Rectus femoris
* L2, L3, L4, femoral nerve

Question 2

Hip Extension

List the muscles and the (innervation including root level)

Answer 2

Gluteus maximus
o L5, S1, S2, inferior gluteal nerve)

Gluteus medius (posterior fibers)
o L4, L5, Si, superior gluteal nerve

Semimembranosus, semitendinosus
o L4, L5, Si, sciatic nerve (tibial division)

Biceps femoris
o L5, S1, sciatic nerve (tibial division for long head / fibular division for short head)

Question 3

Hip Abduction

List the muscles and the (innervation including root level)

Answer 3

Gluteus medius
o L4, L5, S1, superior gluteal nerve

Gluteus minimus
o 14, L5, Si, superior gluteal nerve

Tensor fascia lata (TFL)
o L4, L5, Si, superior gluteal nerve

Question 4

Hip Internal Rotation

Answer 4

Adductor longus, magnus, brevis
o L2, L3, L4, obturator nerve (magnus has some sciatic nerve [tibial division] innervation)
Tensor fascia lata (TFL.)
o 14, L5, S1, superior gluteal nerve
Gluteus medius and minimus
o L4, L5, SI, superior gluteal nerve
Semimembranosus, semitendinosus
o L4, L5, S1, sciatic nerve (tibial division)