The posterior compartment is slightly more complex, in that it is split into superficial and deep layers. Notice how deep the extensor hallucis longus is compared to the tibialis anterior and extensor digitorum longusĬreative commons source by OpenStax College, edited by Sachin Sudhakaran It is responsible for the extension of the hallux/big toe but also contributes to dorsiflexion of the foot.ĭiagram - Anterior compartment of muscles in the leg, highlighted. As the name suggests, these act to extend the toes, whilst also aiding dorsiflexion.Įxtensor Hallucis Longus originates from the medial fibula and inserts into the distal phalanx of the big toe. It also acts to invert the foot.Įxtensor Digitorum Longus originates from the lateral condyle of the tibia and forms four tendons, which insert into a digit (with exception of the hallux/big toe). It attaches to the medial cuneiform (one of the bones in the foot) and acts to dorsiflex the foot. Tibialis Anterior is found on the lateral surface of the tibia, where it originates. Muscles in the anterior compartment act to dorsiflex the foot and are innervated by the deep fibular nerve (a branch of the common fibular nerve). For more information, please check out our Anatomical Terminology Article. It is also very important when studying muscles that you are comfortable with anatomical terminology, as a lot is used in these articles. Whilst there are many muscles in the leg, they can be compartmentalised into anterior, lateral and p osterior fascial compartments. Muscles of the lower leg typically act at the ankle joint and are innervated by branches of the sciatic nerve.
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