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Arches of the foot. The arches of the foot, formed by the tarsal and metatarsal bones, strengthened by ligaments and tendons, allow the foot to support the weight of the body in the erect posture with the least weight. They are categorized as longitudinal and transverse arches.
Muscles in the foot also help support the medial longitudinal arch. 1  These include: 2  flexor hallucis longus. 3  flexor digitorum longus. 4  abductor hallucis. 5  flexor digitorum brevis muscles. 6  tibialis posterior, which is the most important muscle in the maintenance of the arch as damage to its tendon results in collapse of the arch. The tibialis posterior and anterior muscles help to raise the medial border of the arch whilst the flexor hallucis longus acts as a bowstring.