You have reached community.middlebury.edu. If you are looking for the Middlebury College Homepage, please click on the Middlebury College logo.
/suÂ·piÂ·naÂ·tion/ (sooâ³pÄ­-naÂ´shun) [L. supinatio ] the act of assuming the supine position, or the state of being supine. Applied to the hand, the act of turning the palm forward (anteriorly) or upward, performed by lateral rotation of the forearm. Applied to the foot, it generally implies movements resulting in raising of the medial margin of the foot, hence of the longitudinal arch.
The motion occurs moving the thumb away from the palm in a parallel plane to finger flexion. It is very important to realize this motion occurs only at the CMC joint  the most proximal joint of the thumb. There are two abductors named for thumb abduction (APL and APB) but only the median innervated APB (C6  T1) functions as a true thumb ...