Common Peroneal Nerve L4l5

Obturator... externus

Adductor — magnus

Ischial tuberosity

Semitendinosus—i Semimembranosus — Long head of biceps — Adductor magnus --

Obturator... externus

Adductor — magnus

Ischial tuberosity

Semitendinosus—i Semimembranosus — Long head of biceps — Adductor magnus --

Long - head of biceps femoris

. Short head of biceps femoris

Superficial peroneal n.

Peroneus longus

Peroneus brevis

Superficial peroneal n.

Peroneus longus

Peroneus brevis

Extensor hallucis longus

Deep peroneal n. _Tibialis ant.

— Extensor digitorum longus

Extensor hallucis longus

The nerve arises from the division of the sciatic nerve in the popliteal fossa. It bears a close relationship with the head of the fibula as it winds anteriorly. It divides into superficial and deep branches as well as giving off a purely sensory branch which, with sensory twigs from the tibial nerve, forms the sural nerve, mediating sensation from the dorsum and lateral aspect of the foot. Damaged by: - Trauma to the head of the fibula; pressure here from kneeling, crossing legs. - Systemic causes of mononeuropathy, e.g. diabetes. Results in: Weakness of dorsiflexion and eversion of the foot. The patient walks with a 'foot drop'. Sensory loss involves the dorsum and outer aspect of the foot. Partial common peroneal nerve palsies are common with very selective muscle weakness.

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