The intrinsic muscles of the foot are responsible for fine movements of the foot, which include flexion and extension at the MTP and IP joints as well as abduction and adduction of toes. The lateral compartment (peroneal or fibular compartment), which is innervated by the superficial peroneal nerve, contains muscles involved in foot eversion and ankle plantarflexion. The posterior compartment (flexor compartment), which is innervated by the tibial nerve, contains muscles involved in ankle plantarflexion, foot inversion, and knee flexion. The anterior compartment (extensor compartment), which is innervated by the peroneal nerve, contains muscles involved in ankle dorsiflexion and foot eversion. The leg (crus) has an anterior, posterior, and lateral compartment. The foot has one transverse and two longitudinal arches that help distribute body weight. The foot consists of 5 metatarsal bones, the phalanges, metatarsophalangeal ( MTP), and interphalangeal (IP) joints. The talus also articulates with the calcaneus inferiorly forming the subtalar joint and with the navicular anteriorly forming the talonavicular joint. The ankle joint (talocrural joint) is formed by the articulation of the talus with the tibia and fibula. The tarsal bones include the calcaneus, talus, cuboid, navicular bones, and the medial, middle, and lateral cuneiform bones. The leg (crus) extends from the knee to the ankle and contains the tibia and fibula. The lower extremity consists of the hip, thigh, knee, and popliteal fossa, as well as the leg (crus), ankle, and foot.
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