A flexor muscle is a skeletal muscle whose contraction bends a joint, decreasing the angle between components of a limb, such as bending the knee or elbow. This action is known as flexion.

The type of muscle that has the opposite effect is the extensor muscle, which opens a joint, increasing the angle between limb components. some of the flexor muscles of the upper limbs are: the brachialis, the biceps. another tipes of muscles are: abductors, adductors, supinators and rotators In humans, some muscles include 'flexor' in their name, some include;

• Flexor carpi radialis
• Flexor carpi ulnaris
• Flexor digitorum profundus muscle

Muscular system