There is a pair of large nodular sesamoids behind the metacarpo-phalangeal articulation, and a single large transversely-extended sesamoid behind the joint between the second and third phalanx, called the " navicular bone." [Please select]
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This extremity, the superior extremity of the first phalanx, which articulates with it, together with two sesamoid bones--the great sesamoids--which are situated on its posterior surface, collectively form the region which from its rounded outlines is called the _ball_. [Please select]
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