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The condition of being prone; the act of assuming or of being placed in a prone position; a specific rotational motion of the forearm that moves the palm into a downfacing position, a specific rotational motion of the foot in which the plantar surface is rotated outward.
- p. of forearm rotation of the forearm in such a way that the palm of the hand faces backward when the arm is in the anatomic position, or downward when the arm is extended at a right angle to the body.
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a) rotation of the hand and forearm so that the palm faces backwards or downwards
b) rotation of the medial bones in the midtarsal region of the foot inward and downward so that in walking the foot tends to come down on its inner margin
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n.
the act of turning the hand so that the palm faces downwards. In this position the bones of the forearm (radius and ulna) are crossed. Compare supination.
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pro·na·tion (pro-naґshən) [L. pronatio] the act of assuming the prone position, or the state of being prone. Applied to the hand, the act of turning the palm posteriorly (or inferiorly when the forearm is flexed), performed by medial rotation of the forearm. Applied to the foot, rotation of the front of the foot laterally relative to the back of the foot, resulting in lowering of the medial margin of the foot and hence of the longitudinal arch. Cf. supination.
Pronation of forearm: the hand is turned by the crossing of the radius over the ulna.
Medical dictionary. 2011.