30/12/2024
Foot and Ankle: Anterior Structures - Tendons, Blood Vessels, and Nerves 🦶🏼
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1. Extensor Tendons 🦶🏼💪🏼
The primary tendons in the anterior compartment are responsible for dorsiflexion of the foot and extension of the toes. These tendons pass over the ankle joint, and their functions are as follows:
* Tibialis anterior tendon: The most prominent tendon, located medially, it dorsiflexes and inverts the foot.
* Extensor hallucis longus tendon: Located between tibialis anterior and extensor digitorum longus, it extends the big toe and assists in dorsiflexion.
* Extensor digitorum longus tendon: Situated laterally to the tibialis anterior, it extends the second to fifth toes and also aids in dorsiflexion.
* Peroneus tertius tendon: Often considered part of the extensor digitorum longus, it dorsiflexes and everts the foot. Not everyone has one of these!
These tendons are protected by a fibrous sheath called the extensor retinaculum at the ankle.
2. Anterior Tibial Artery 🩸
The anterior tibial artery is a branch of the popliteal artery. At the level of the ankle, the artery becomes the dorsalis pedis artery, which is palpated at the dorsal aspect of the foot to assess circulation.
3. Deep Peroneal Nerve ⚡️
The deep peroneal nerve (also called the deep fibular nerve) is a branch of the common peroneal nerve. It innervates the muscles of the anterior compartment, including the tibialis anterior, extensor hallucis longus, extensor digitorum longus, and peroneus tertius. This nerve also provides sensory innervation to the first dorsal web space (between the first and second toes). The deep peroneal nerve travels along the interosseous membrane and passes under the extensor retinaculum of the ankle.
💡 The POSTERIOR structures have a different mnemonic:
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