Pronator teres is an arm muscle which has two functions:
It originates from two sites:
The median nerve passes between the two heads before they fuse. The muscle then passes obliquely across the arm to attach to the lateral surface of the radius near its point of maximum convexity.
It is innervated by the first branch of the median nerve (C6, C7) which usually arises in the forearm but infrequently arises in the arm.
Pronator teres forms the medial boundary of the cubital fossa and it is at this site that the muscle is palpated when it is tested by pronation against resistance.
Last reviewed 01/2018