Extensor digitorum brevis muscle

The extensor digitorum brevis muscle is a muscle on the upper surface of the foot that helps extend digits 2 through 4.

Structure
The extensor digitorum brevis is found on the back of the foot. It arises with the extensor hallucis brevis muscle from the calcaneus bone; many consider these two muscles are a single common muscle.

The extensor digitorum brevis divides into three tendons, which insert on the second, third, and fourth middle phalanges.

Innervation
The extensor digitorum brevis is innervated by the deep fibular nerve (deep peroneal nerve).

Action
The extensor digitorum brevis help to extend the toes to which it attaches.