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Since the intersseous muscles cross on the metatarsophalangeal joint, then they act on that specific joint and cause adduction of toes III, IV, and V. [1] Adduction itself is not of extreme importance to the toes, but these muscles work together with the dorsal interosseous muscles in flexion of the foot.
The interosseous muscles of the foot are muscles found near the metatarsal bones that help to control the toes. They are considered voluntary muscles. They are generally divided into two sets: 4 Dorsal interossei - Abduct the digits away from the 2nd digit (away from axial line) and are bipennate.
plantar interossei 1-3 Lower limb, plantar, Fourth layer, left/right tendons of plantar Interossei: proximal phalanges III-V - muscles cross the metatarsophalangeal joint of toes III-V so the insertions correspond with the origin and there is no crossing between toes plantar arch, dorsal metatarsal artery: lateral plantar nerve
The arch is further supported by the plantar aponeurosis, by the small muscles in the sole of the foot (short muscles of the big toe), by the tendons of the tibialis anterior and posterior and fibularis longus, flexor digitorum longus, flexor hallucis longus and by the ligaments of all the articulations involved. [1]
The quadratus plantae arises with two slips from margins of the plantar surface of the calcaneus and is inserted into the tendon(s) of the flexor digitorum longus, and is known as the "plantar head" of this latter muscle. The three plantar interossei arise with their single heads on the medial side of the third-fifth metatarsals and are ...
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All dorsal interossei are innervated by the lateral plantar nerve (S2–3). Those in the fourth interosseous space are innervated by the superficial branch and the other by the deep branch. [1] The first and second dorsal interossei muscles additionally receive innervation from the lateral branch of the deep fibular nerve. [4]
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