Flexor

Flexor surface refers to the body surface which is on the inner side of a joint. For example, the ventral body surface situated on the front of the elbow or that which is located behind the knee joint.

The flexor surfaces cover the flexor muscles, which overlay the ventral aspects of joints. Upon contraction, the flexor muscles bend the joint and bring the flexor surfaces in close apposition with each other, thereby reducing the angle between the bones.

In case of hands and feet, the flexor surfaces are specifically known as ‘palmar’ and ‘plantar’, respectively.