Extensor digitorum brevis

The extensor digitorum brevis (also extensor digitorum brevis muscle, latin: musculus extensor digitorum brevis) is a muscle of the upper surface (dorsum) of the foot that aids in extending the second, third and fourth digits of the foot.

Origin

The extensor digitorum brevis originates from the superior and lateral surface of the calcaneus.

Insertion

The fibers of the extensor digitorum brevis pass forwards and insert into the tendon of the extensor digitorum longus.

Action

The main function of the extensor digitorum brevis is to extend the second, third and fourth (II - IV) digits of the foot.

Innervation

The extensor digitorum brevis is innervated by the deep peroneal nerve (also known as deep fibular nerve), a branch of the common peroneal (fibular) nerve.