Golgi tendon organ

The Golgi tendon organ (GTO) (also known as Golgi organ, tendon organ, neurotendinous organ or neurotendinous spindle) is a skeletal muscle stretch receptor proprioceptor. It is situated at the interface between a muscle and its tendon known as the musculotendinous junction. It senses muscle tension (whereas muscle spindles are responsible for detecting muscle length and changes in muscle length). It is innervated by type Ib sensory nerve fibers.

It represents the sensory leg of the Golgi tendon reflex arc.

The Golgi tendon organ is one of several eponymous terms named after the Italian physician Camillo Golgi.