Extensor Hallucis Brevis, Dorsal View

Description

Arising from the superolateral aspect of the calcaneus within the floor of the sinus tarsi, the extensor hallucis brevis (often shown as the medial slip of extensor digitorum brevis) lies on the dorsum of the foot deep to the extensor tendons. Its muscle belly sits lateral to the tendon of extensor hallucis longus and medial to the extensor digitorum longus tendons, then tapers distally toward the hallux to join the dorsal apparatus around the proximal phalanx. The dorsal perspective also logically includes the extensor retinacula at the anterior ankle, the talus and calcaneus proximally, and the long extensor tendons coursing distally over the midfoot. Clinically, this view helps you teach where dorsal midfoot pain can originate when the extensor hallucis brevis or extensor digitorum brevis is strained in runners or after an inversion injury, and how that pain differs from irritation of the extensor hallucis longus tendon under the extensor retinaculum. The muscle’s origin near the calcaneus and its intimate relationship to the dorsalis pedis artery and deep fibular (peroneal) nerve on the dorsum makes it a practical landmark during dorsal approaches to the midfoot and for interpreting swelling in the sinus tarsi region. Small muscle, common source of confusion. Use this asset in gross anatomy teaching of the dorsal foot, podiatry and sports medicine lectures on extensor mechanism injuries, and surgical atlases describing dorsal incisions for midfoot arthrodesis or tendon procedures around the hallux. Anatomical accuracy verified by SciePro's Medical Advisory Board.