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Finger bone and joint injuries. And, it is logical that a conservative, highly functional adaptation be followed by a series of more complex ones that complement it. The skeleton of the thumb consists of the first metacarpal bone which articulates proximally with the carpus at the carpometacarpal joint and distally with the proximal phalanx at the metacarpophalangeal joint. Why do orangutans have opposable thumbs? What type of thing is likely to have an opposable thumb other than a mammal? The nerves that innervate the various muscles controlling the thumb include branches of the radial nerve, branches of the median nerve, and the deep palmar branch of the ulnar nerve.

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