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of the radius towards the ulna, thus pronating the hand. Its deep fibers serve to keep the two bones in the forearm bound together. Moreover, this muscle can be absent in some humans, however, that does not affect the action of pronation very notably, as the pronator teres does the major role in that action.

Spinal tracts

The lateral corticospinal tract is responsible for the motor pathway of the pronator quadratus. This tract begins in the precentral gyrus of the motor cortex where

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