The temporomandibular joints have the highest number of proprioceptive nerves in your horse's entire body.
Proprioception is defined as awareness of the position of one's body.
This means the TMJs functions as a part of the neurological system that governs balance and equilibrium. Because the components of this stomatognathic system include dural connections from the cervical spine all the way to the sacrum and pelvis, we often see reciprocal patterns. Pathologies, pressure, restriction in the TMJs can often be seen as changes, restrictions, pathologies in the sacrum and pelvis. Basically, the TMJ can in some cases be the primary source of hind end discomfort.
Causes of TMJ problems include poor dental care, injuries such as pulling back or being kicked, pressure from bits/rider, lack of grazing, and even having dental work performed. Always a good idea to have the TMJs addresses after a visit from your equine dentist.