Part of the thumb



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 part of the thumb the metacarpophalangeal joint. Modern humans are unique in the musculature of their forearm and hand. Like human hands, the thumb of a robotic hand also plays a key role in gripping an object. It inserts to the radial sesamoid bone and the proximal phalanx of the thumb.



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Part of the thumb
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It is part of the thumb by the deep branch of part of the thumb ulnar nerve C8-T1. The spider monkey compensates for this by using the hairless part of its long, prehensile tail for grabbing objects. The tendons of the extensor pollicis longus and extensor pollicis brevis form what is known as the anatomical snuff box an indentation on the lateral aspect of the thumb at its base The radial artery can be palpated anteriorly at the wrist not in the snuffbox. The evolution of the fully opposable thumb is usually associated with Homo habilisa forerunner of Homo sapiens. Yet, they remain autapomorphic, meaning each muscle is found in one or more non-human primates.

Part of the thumb
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Journal of Human Evolution. It extends the thumb and, because of its close relationship to the long abductor, also abducts the thumb. Bones of the thumb, visible at far left. Approximately 1 in 6 U. It acts to flex, adduct, and abduct the thumb, and is therefore also able to oppose the thumb.

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