Corpus: Extensor digitorum longus muscle
1. Definition
The extensor digitorum longus muscle is a skeletal muscle of the lower extremity. It is part of the anterior group, i.e. the extensors of the lower leg muscles.
2. Progression
2.1. Origin
The extensor digitorum longus muscle has a broad origin on the lower leg, including the lateral condyle of the tibia, the interosseous membrane of the leg, the anterior surface of the fibula, and the anterior intermuscular septum of the leg.
2.2. Attachment
The tendon of the extensor digitorum longus muscle runs under the superior and inferior extensor retinacula on the lateral side of the ankle joint to the foot. It then fans out towards the dorsal aponeuroses of toes 2-5 and joins them.
3. Innervation
The extensor digitorum longus muscle is innervated by the deep fibular nerve.
4. Function
The extensor digitorum longus muscle is responsible for the extension (dorsiflexion) of toes 2-5. It also assists in dorsiflexion at the talocrural joint and eversion at the talotarsal joint. Additionally, it supports the pronation of the foot.