Vestibulocollic and Cervicocollic Control
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Control of the neck is exerted primarily by two sensory systems, the vestibular system in response to the signals received by the vestibular end organs (the otoliths and the semicircular canals within the vestibular labyrinths) and the proprioceptors of the cervical spine. Two automatic and stereotypical responses can be elicited by direct stimulation of these receptors. The vestibulocollic reflex (VCR) is a compensatory response of the neck muscles when head motion is sensed by the vestibular organs in the inner ear. The cervicocollic reflex (CCR) is a compensatory response of the neck muscles that is driven by neck proprioceptive inputs during motion of the body.
Description of the Theory