Answer: Its shape and its action
Step-by-step explanation:
The pronator teres is a muscle which is located in the forearm of the human beings. The other muscles found in combination with this pronator quadratus.
This muscle has two heads- ulnar and humeral. The humeral heads of the muscle are large and more superficial.
The ulnar region is thin fasciculus which originates from the medial side of the coronoid process of ulna.