Extensor longus muscle

Extensor longus muscle

Extensor longus muscle (shown in red). Image adapted from Gray's Anatomy.

The Extensor longus muscle is a muscle located in the anterior compartment of the leg. It is responsible for extending the toes and dorsiflexing the foot at the ankle.

Structure

The Extensor longus muscle originates from the upper 2/3 of the fibula, the interosseous membrane, and the intermuscular septa. It inserts into the dorsal surface of the base of the distal phalanx of the big toe.

Function

The Extensor longus muscle is responsible for extending the toes and dorsiflexing the foot at the ankle. This action is crucial for walking and running.

Clinical significance

Damage to the Extensor longus muscle can result in foot drop, a condition where the individual is unable to lift the front part of the foot. This can lead to the person dragging their foot while walking.

See also

• Extensor digitorum longus muscle
• Extensor hallucis longus muscle
• Extensor digitorum brevis muscle
• Extensor hallucis brevis muscle