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The thumb is crucial to the overall function of the hand, with amputation leading to about 40% impairment. Because of value of thumb, reimplantation at any level is recommended. It also accounts to around 22% disability of the individual as a whole. The thumbs actions are flexion, extension, abduction (palmar and radial), adduction and opposition.
Lesson on Thumb Abduction vs. Adduction, Flexion vs. Extension and Opposition (Clinical Skills Lesson). Terminology involving movements of the thumb can be d...
- 2 min
- 469.3K
- JJ Medicine
As its name suggests, it opposes the thumb, bringing it against the fingers. This is a very important movement, as most of human hand dexterity including grip comes from this action. The abductor pollicis brevis originates on the scaphoid tubercle and the flexor retinaculum. It inserts to the radial sesamoid bone and the proximal phalanx of the ...
Sep 27, 2024 · The thenar muscles are three short muscles located at the base of the thumb. The muscle bellies produce a bulge, known as the thenar eminence. They are responsible for the fine movements of the thumb. The median nerve innervates all the thenar muscles. Opponens Pollicis. The opponens pollicis is the largest of the thenar muscles, and lies ...
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Nov 13, 2023 · The main function of the thenar muscles is to produce the movements of the thumb. More specifically, these muscles are responsible for the abduction and flexion of the thumb at the metacarpophalangeal (MCP) and carpometacarpal (CMC) joints. Together with the adductor pollicis muscle, their combined actions can produce the opposition of the ...
- Content Manager
- 11 min
- Median nerve (T1), ulnar nerve (C8, T1)
Dr. Ebraheim's animated educational video describes motions of the thumb.The motions of the thumb are complex and are often difficult to visualize, as multip...
- 5 min
- 139.8K
- nabil ebraheim
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Nov 28, 2023 · The tip to tip connection of the fingers is caused by flexion of the fingers, with flexion and opposition of the thumb. This grip can be used for manipulation of small objects, e.g. sewing. When an individual is sewing, they hold the needle between the pulp of their index and thumb.
