Nerves of Lumbosacral Plexus 3

Deep Fibular Nerve

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Cutaneous:

Origin: Common Fibular Nerve

Course: Courses deep to fibularis longus muscle and extensor digitorum longus on surface of interosseous membrane of leg deep to extensor retinaculum

Branch: Muscular and dorsal digital branches

Motor: Anterior compartment of leg

Cutaneous: Dorsal aspect of adjacent parts of toes 1 and 2

Superficial Fibular Nerve

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Origin: Common fibular nerve

Course: Courses between fibularis longus and brevis muscles in lateral compartment of leg, piercing crural fascia distally

Branch: Muscular branches, medial and intermediate dorsal cutaneous nerves of foot

Motor: Lateral compartment of leg

Cutaneous: Distal part of anterior leg, dorsum of foot and toes

Lateral Sural Cutaneous Nerve

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Origin: Common fibular nerve

Course: Branches from common fibular nerve just proximal to plantaris muscle

Branch:

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Cutaneous: Lateral leg

Medial Sural Cutaneous Nerve

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Origin: Tibial Nerve

Course: Branches from tibial nerve just proximal to plantaris muscle, runs between both heads of gastrocnemius muscle, pierces crural fascia

Branch: Sural Nerve

Motor:

Cutaneous: Proximal posterolateral leg

Sural Nerve

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Origin: Union of medial sural cutaneous nerve and sural communicating branch of common fibular nerve

Course: Descends sural region along lateral calcaneal tendon and into foot between lateral malleolus and calcaneus

Branch: Lateral dorsal cutaneous nerve of foot

Motor:

Cutaneous: Distal posterolateral leg, lateral foot

Lateral Plantar Nerve

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Origin: Tibial Nerve

Course: Passes deep to abductor hallucis brevis and travels between flexor digitorum brevis and quadratus plantae muscles

Branch: Superficial and deep branches

Motor: Abductor digiti minimi, adductor hallucis, flexor digiti minimi, quadratus plantae muscle, dorsal and plantar interossei muscles, lumbrical muscles (lateral three)

Cutaneous: Lateral sole, plantar aspect of 5th toe and part of 4th toe

Medial Plantar Nerve

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Origin: Tibial Nerve

Course: Passes deep to abductor hallucis brevis and runs anteriorly along medial border of flexor digitorum brevis

Branch: Muscular and common plantar digital branches

Motor: Abductor hallucis, flexor digitorum brevis, flexor hallucis brevis, lumbrical muscles (most medial one)

Cutaneous: Medial sole, plantar aspect of toes 1-3, and part of 4th toe