The pronator teres muscle is located in the anterior compartment of the forearm, forming part of the deep muscles in the region. It is a relatively small and elongated muscle that runs diagonally across the forearm.
Originating from the medial epicondyle of the humerus and the coronoid process of the ulna, the pronator teres takes its starting point from the bony structures of the elbow and forearm.
The muscle inserts into the midshaft of the radius. This insertion site establishes a connection with the forearm bone.
Functionally, the pronator teres is a powerful pronator of the forearm. It plays a key role in rotating the radius over the ulna, turning the palm downward or facing backward. Additionally, the muscle assists in flexion of the elbow joint and contributes to the control of forearm movements during activities such as grasping and holding objects. The pronator teres is particularly active in actions that involve pronation of the forearm, such as turning a screwdriver or using a hammer. It contributes to the complex movements and functional range of motion in the lower arm.