Proprioception is the ability of the body to sense its position in space. Muscles contribute to proprioception.
Sensory nerve endings include those on muscle spindles, which are sensitive to length, and in the Golgi tendon organs, which are sensitive to tension. There is also a variety of free endings in the muscle, some of which are involved in sensations of pain. These nerve endings transmit information to the central nervous system, including the motor neurons that innervate the muscle. Through reflexes and higher order processing, postural adjustments are made and the body “senses” the positions of the limbs in space.