Long extensor of fingers

Long extensor of fingers, m. Extensor digitorum longus, lies outside of the previous muscle. In the lower third of the shin, a tendon m passes between these muscles. Extensor hallucis longus. The muscle originates from the upper third of the tibia , from the head and anterior margin of the fibula , from the interosseous membrane of the lower leg, the anterior intermuscular septum of the lower leg, the fascia of the shin. Then the muscle goes down, gradually narrows and passes into a narrow long tendon that passes under retinaculum mm. Extensorum inferius in the lateral canal. Even before entering the canal, the tendon is divided into four thin individual tendons which, on the rear surface of the foot, are attached to the base of the proximal phalanges of the four toes of the foot, from II to V. At the attachment site, each of the tendons is divided into three tufts; The middle bundle ends on the base of the middle phalanx, and both extremes on the base of the distal phalanx.

Function: Extends the four toes of the foot (II-V), the foot, and together with the third fibular muscle raises (penetrates) the outer edge of the foot.

Innervation: n. Peroneus profundus (LIV-SI).

Blood supply: a. Tibialis anterior.