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6. Proximal and Middle Phalanges

The proximal phalanx is the first and largest bone in the finger. It forms a joint with a metacarpal bone and a middle phalanx. The middle phalanx is the second bone and forms a joint at each end with a proximal and distal phalanx. Proximal and middle phalanges are concave on the underside and convex on the upper surface. The middle of each phalanx is the narrowest section of the bone.

phalanges bones LauriPatterson / Getty Images

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