Figure 1.

Cervicovestibular trigeminosympathetic system: the anatomic and functional connections between the trigeminal, vestibular, cervical, and sympathetic systems which are often involved in postconcussion syndrome. Cervical roots and the trigeminal system run proximal to each other with convergence of their afferents. The vestibulocollic and vestibulospinal tract controls the neck and truck tone. Cervical roots are in close proximity and communicate with the cervical sympathetic chains which are connections to the autonomic nervous system. TG, trigeminal ganglion; C1/2/3, cervical roots.