Pronator teres

Definition

The pronator teres is a muscle in the forearm that enables the hand to turn so the palm faces downwards or backwards. It originates from the medial epicondyle of the humerus and inserts into the radius bone of the forearm.

Related terms

Medial Epicondyle:

A bony projection on the inner side of the humerus where muscles including the pronator teres attach.

Radius:

One of the two large bones in the forearm, onto which the pronator teres muscle inserts for performing rotation.

Supination:

The opposite movement produced by different muscles, rotating the forearm so that the palm faces upwards or forwards