Extension of the metacarpophalangeal (MCP) joint of the second digit results in a ____________________ roll and a ____________________ glide of the proximal phalanx on the metacarpal
a. dorsal, dorsal
b. volar, volar
c. dorsal, volar
d. volar, dorsal
ANS: A
The MCP joint consists of the convex surface of the metacarpal heads and the concave surface of the base of the phalanx. This would lend to a concave on convex relationship during extension of this joint and, anatomically speaking, would cause a dorsal roll and glide of the phalanx on the metacarpal.
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