proprioceptor

A sensory receptor, found chiefly in muscles, tendons, joints, and the inner ear, that detects the motion or position of the body or a limb by responding to stimuli arising within the organism.

A nerve ending that functions as a sensory receptor in muscles, tendons, joints and the inner ear; they respond to movement and position

special nerve endings in the muscles and tendons and other organs that respond to stimuli regarding the position and movement of the body