dorsal digital expansion

expansion /ex·pan·sion/ (ek-span´shun)

1. the process or state of being increased in extent, surface, or bulk.

2. a region or area of increased bulk or surface.

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clonal expansion  an immunological response in which lymphocytes stimulated by antigen proliferate and amplify the population of relevant cells.

dorsal digital expansion , extensor expansion extensor aponeurosis; a triangular aponeurotic extension of the digital extensor tendon on the dorsum of the proximal phalanx of each digit, to which the tendons of the lumbrical and interosseous muscles are also attached, forming a movable hood around the metacarpophalangeal joint.

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dorsal digital expansion,

a triangular aponeurotic extension of the digital extensor tendon on the dorsum of the proximal phalanx of each digit, to which the tendons of the lumbrical and interosseous muscles are also attached. It forms a movable hood around the metacarpophalangeal joint. Also called extensor aponeurosis, hood.