muscle sense

The former refers to anything that is skin related, whereas the latter is muscle sense.

His study on muscle sense contributed to understanding of the part played by the cerebellum in balance,

Ib fibers are related to golgi tendon organs (muscle sense)

The thalamus acts as a reception center for the somesthetic sensations - touch, pain, heat, cold, and the muscle senses.

Ia fibers are related to muscle spindle primary endings (muscle sense)

Much later, in 1826, Charles Bell expounded the idea of a "muscle sense" and this is credited with being one of the first described physiologic feedback mechanisms.

Later, in 1880, Henry Charlton Bastian suggested "kinaesthesia" instead of "muscle sense" on the basis that some of the afferent information (back to the brain) was coming from other structures including tendons, joints, and skin.