Atlas of Human Anatomy by Netter

Obturator nerve (L2-L4)

Enters thigh through obturator foramen and divides into anterior and posterior branches

Supplies medial (adductor) compartment of thigh

Nerves of posterior thigh

Sciatic nerve (L5-S2)

Enters gluteal region from pelvis through greater sciatic foramen

Emerges inferior to the piriformis muscle

Supplies no structures in the gluteal region

Supplies posterior thigh muscles

Bifurcates in lower third of thigh into tibial and common fibular nerves

Via tibial and common fibular nerves, supplies all leg and foot muscles

Nerves of leg

Tibial nerve

Supplies the posterior compartment of leg

Ends by dividing into medial and lateral planter nerves

Common fibular nerve

Wraps around fibular head

Divides into deep and superficial peroneal nerves

Deep fibular nerve supplies anterior compartment of leg

Superficial fibular nerve supplies lateral compartment of leg

Nerves of foot

Medial plantar to 3½ muscles of plantar foot

Lateral plantar to remaining muscle of plantar foot

Dermatomes

Myotomes

A group of muscles supplied by fibers from a single spinal nerve or a discrete group of spinal nerves is called a myotome

Myotomes of the Lower Limb

L2 L3 L4 L5 S1 S2

Hip Flexion X X

Extension X X

Knee Extension X X

Flexion X X

Ankle Dorsiflexion X X

Plantarflexion X X

Foot Inversion X X

Eversion X X

Intrinsic X