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Long abductor muscle of thumb (APL), is one of the extrinsic muscles (external) of the hand. It is just below the supinator muscle and is sometimes united with him.
Muscle origin and insertion Thumb Abductor
Abductor muscle of thumb, originates from the side of the dorsal surface of the body below the insertion of the ulnar Anconæus. Interosseous membrane, and the middle third of the dorsal surface of the body of radio.
Passing obliquely downward and laterally, ending in a tendon, which runs through a slot in the side of the lower end of the radio, accompanied by the tendon of extensor pollicis brevis, and inserted into the radial side of the base first metacarpal bone.
From time to time issued two sheets near its insertion: A multi-angle bone called the largest and one to mix with the origin of the Abductor pollicis brevis.
Abductor Muscle Action over Thumb
The main action of muscular with long abductor of thumb is to kidnap, abduct or retract the thumb at the carpometacarpal joint, bringing the thumb moves forward with its corresponding continuous action to help kidnap, abduct or retract the wrist.
Abductor Muscle variations along the Thumb
Roughly doubles the muscle and tendon of insertion of extra tendon in the first metacarpal, the largest multi-angles, the abductor pollicis brevis or opponens pollicis.
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