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عمومی::
مفصل متاکارپوفالانژیال
The heads of the metacarpals articulate with the bases of the proximal phalanges of each digit; this point is known as the metacarpophalangeal joints, also known as knuckles.
It is inserted into the base of the proximal phalanx of the thumb and the metacarpophalangeal joint by a thin flat tendon.
Flexor Pollicis Brevis lies next to the abductor, and it flexes the thumb at the metacarpophalangeal joint as well as the flexing and rotation of the first metacarpal bone where the metacarpal bone of the thumb joins the carpal bones of the wrist, the carpometacarpal joint.
Their job is to abduct (spread) the fingers, as well as to assist with the flexion at the metacarpophalangeal joints and extension at the interphalangeal joints of the index, middle and ring fingers.
Their job is to adduct (bring together) the fingers, as well as assisting the flexion at the metacarpophalangeal joints and extension at the interphalangeal joints of the index, ring, and little fingers.
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