The extrinsic foot muscles are located in the leg, while the intrinsic foot muscles are located in the foot. The gastrocnemius, soleus, fibularis longus, fibularis brevis, tibialis posterior. The muscles acting on the foot can be divided into two distinct groups; extrinsic and intrinsic muscles. The extrinsic muscles arise from the anterior, posterior and lateral compartments of the leg. They are mainly responsible for actions such as eversion, inversion, plantarflexion and dorsiflexion of the foot.
in·trin·sic mus·cles of foot
muscles fully contained (origin, belly, installation) in the foot and toes. These muscles are organized in four levels; all are usually innervated by the plantar twigs of the tibial sensors. Although they may be able of creating the activities defined under their individual entries, as a team the main function of the intrinsic muscles of the foot will be to supply dynamic support of the longitudinal posture of the foot, resisting those energies that work briefly to spread the arc during strolling and working.
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