Pronator teres muscle
The pronator teres originates from several points on the humerus at the elbow joint, and on the ulna. On the humerus, it attaches to the medial epicondyle, the medial supracondylar ridge, and the medial intermuscular septum. On the ulna, it attaches to the medial border of the ulnar coronoid process.
The pronator teres is innervated by the median nerve (C6 and C7).