Pronator Teres

Picture:
pronator-teres.jpg
Origin: Medial epicondyle of humerus and coronoid process of ulna
Insertion: Middle of lateral surface of radius
Action: Pronates and flexes forearm (at elbow)
Strengthening: bent-over rows, single-arm rows, lat pulldowns and low pulley rows, rotate the dumbbell so your thumb is facing down, then return to your starting position
Rehabilitation: Stand with your back toward the inside of a door frame and extend your left arm straight above the midpoint between your hip and shoulder. Hold the door frame with your left hand, keeping your thumb pointing down, and roll your biceps upwards and have it massaged by a professional
Interesting Fact: The pronator teres sometimes puts pressure on the median nerve in the arm. This can cause numbness in the hand and is sometimes diagnosed as carpal tunnel syndrome


Sources:

https://rad.washington.edu/muscle-atlas/pronator-teres/
https://healthfully.com/exercises-pronator-teres-12274528.html

https://www.livestrong.com/article/456679-pronator-teres-syndrome-and-exercise-rehabilitation/
http://thewellnessdigest.com/pronator-teres-muscle-forearm-wrist-thumb-pain/