Metacarpophalangeal joint

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The metacarpophalangeal joints (MCP) are the joints in the knuckles of the hands that are situated between the metacarpal (palm) bones and the proximal phalanges (first bone of each finger). These joints are of the condyloid kind, formed by the reception of the rounded heads of the metacarpal bones into shallow cavities on the proximal ends (nearest the palm) of the proximal phalanges. Because they are condyloid, they allow joint movements of flexion (hand closing), extension (hand opening), abduction (spreading the fingers), adduction (squeezing together of the fingers) and circumduction (see anatomical terms of motion) at the joint.

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