![]() ![]() ![]() Bevægeapparatets anatomi (in Danish) (12th ed.). ^ a b Bojsen-Møller, Finn Simonsen, Erik B.The horizontal head of the adductor hallucis from the deep transverse metatarsal ligament, a narrow band which runs across and connects together the heads of all the metatarsal bones. The function of the muscle is to move the fourth toe medially and move the toes together. The third Plantar interosseus muscle originates from the medial side of the base and shaft of the fifth metatarsal. The function of the muscle is to spread the toes. The fourth dorsal interosseus muscle originates from the medial side of shaft. The plantar surface of the base is grooved for the tendon of the abductor digiti quinti, and gives origin to the flexor digiti minimi brevis. The tendon of the fibularis tertius inserts on the medial part of the dorsal surface and the fibularis brevis on the dorsal surface of the tuberosity. Os vesalianum, an accessory bone which is present in between 0.1 - 1% of the population.The "apophysis", which is the secondary ossification center of the bone, and is normally present at 10 – 16 years of age.Normal anatomy that may simulate a fracture include mainly: A tuberosity fracture is also called a pseudo-Jones fracture or a dancer's fracture.Due to poor blood supply in this area, such a fracture sometimes does not heal and surgery is required. A metaphysis fracture is also called a Jones fracture.A proximal diaphysis fracture is typically a stress fracture, commonly among athletes.Proximal fractures of the fifth metatarsal are common, and are distinguished by their locations: The head articulates with the fifth proximal phalanx, the first bone in the fifth toe.Ī strong band of the plantar aponeurosis connects the projecting part of the tuberosity with the lateral process of the tuberosity of the calcaneus. The plantar surface of the base is grooved for the tendon of the abductor digiti quinti. The fifth metatarsal has a rough eminence on the lateral side of its base, known as the tuberosity or the styloid process. The base articulates behind, by a triangular surface cut obliquely in a transverse direction, with the cuboid and medially, with the fourth metatarsal. The bone is curved longitudinally, so as to be concave below, slightly convex above. These surfaces are rough for the attachment of ligaments. The bone is somewhat flat giving it two surfaces the plantar (towards the sole of the foot) and the dorsal side (the area facing upwards while standing). The narrowed part in the middle is referred to as the body (or shaft) of the bone. The base is the part closest to the ankle and the head is closest to the toes. Īs with the four other metatarsal bones it can be divided into three parts a base, body and head. The fifth metatarsal is analogous to the fifth metacarpal bone in the hand. It is the second smallest of the five metatarsal bones. The fifth metatarsal bone is a long bone in the foot, and is palpable along the distal outer edges of the feet. ![]()
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