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Middle Phalanges

Intermediate or middle phalanges are bones found in the limbs of most vertebrates. In humans, they are the bones of the finger and toe which lie in the middle, between the two wrinkly joints. The thumb and big toe do not have intermediate phalanges. In most other vertebrates, they have a corresponding place in their limbs, whether they be paw, wing, hoof or fin. These bones' distal surface has a double concave articular face with a central spline that limits the bone's movement with the proximal phalanx to the dorsopalmar plane. The head end of the middle phalanges forms a similar articular surface with the distal phalanges. The intermediate phalanx is not only intermediate in location, but is also usually intermediate in size among the other phalanges ("finger" bones).


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