what is a extensor muscle
An extensor muscle is a muscle that works to extend or straighten a body part, effectively enlarging the angle between body parts.Examples of extensor muscles include the muscles that straighten the elbow or the knee.ll of these muscles are anchored to the bone of the upper arm, the humerus, by a common tendon, known as the common extensor tendon. These muscles serve primarily to extend the wrist and fingers. Ad. The main muscle that works to straighten the arm by extending the elbow joint is the triceps brachii extensor muscle.