Lower Extremity Cutaneous Innervation, Dermatomes, and Myotomes

Dermatome L1

Inguinal ligament/groin

Dermatome L2

Anterior thigh

Dermatome L3

anteromedial patella

Dermatome L4

Medial leg/medial malleolus

Dermatome L5

Tip of Digit I/Dorsum foot

Dermatome S1

Lateral border foot

Dermatome S2

Posterior knee (mid popliteal region)

Dermatome S2,3,4

Buttocks (saddle region)

Cutaneous Innervation - Anterior Thigh

femoral nerve

Cutaneous Innervation - Posterior Thigh

posterior femoral cutaneous nerve

Cutaneous innervation - lateral thigh

lateral femoral cutaneous nerve

Cutaneous innervation - small region of medial thigh

obturator nerve

Cutaneous innervation. - anterior knee

femoral nerve

Cutaneous innervation - posterior knee

posterior femoral cutaneous nerve

cutaneous innervation - medial leg

saphenous nerve

cutaneous innervation - lateral leg

sural nerves

cutaneous innervation - heel of foot

tibial nerve

cutaneous innervation - medial sole of foot

medial plantar nerve

cutaneous innervation - lateral sole of foot

lateral plantar nerve

cutaneous innervation - dorsal webbing between digit I & II

deep fibular nerve

Cutaneous innervation - dorsum of foot (minus webbing between I & II)

superficial fibular nerve

Myotome L2

hip flexion

Myotome L3

knee extension

Myotome L4

ankle dorsiflexion

Myotome L5

hallux extension

Myotome S1

foot eversion, plantarflexion

Myotome S2

knee flexion