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Radial side of the proximal phalanx of the index finger: 2 Radial side of the middle phalanx of the index finger: 3 Tip of the index finger: 4 Tip of the middle finger: 5 Tip of the ring finger: 6 Tip of the little finger: 7 Distal interphalangeal joint crease of the little finger: 8 Proximal interphalangeal joint crease of the little finger: 9
Opposition of the thumb is a combination of actions that allows the tip of the thumb to touch the tips of other fingers. The part of apposition that this muscle is responsible for is the flexion of the thumb's metacarpal at the first carpometacarpal joint. This specific action cups the palm.
Nintendo thumb, also known as gamer's thumb [1] and similar names, is a form of repetitive strain injury (RSI) caused by excessive playing of video games with the traditional Nintendo controller. [2] This injury mainly occurs due to repeated thumb movements while playing video games. [ 3 ]
In human anatomy, the adductor pollicis muscle is a muscle in the hand that functions to adduct the thumb. It has two heads: transverse and oblique. It is a fleshy, flat, triangular, and fan-shaped muscle deep in the thenar compartment beneath the long flexor tendons and the lumbrical muscles at the center of the palm.
The muscles of the thumb are nine skeletal muscles located in the hand and forearm. The muscles allow for flexion , extension , adduction , abduction and opposition of the thumb . The muscles acting on the thumb can be divided into two groups: The extrinsic hand muscles, with their muscle bellies located in the forearm, and the intrinsic hand ...
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Abduction of the thumb is defined as the movement of the thumb anteriorly, a direction perpendicular to the palm. The abductor pollicis brevis does this by acting across both the carpometacarpal joint and the metacarpophalangeal joint. It also assists in opposition and extension of the thumb.
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