NCIt definition : The initial segment of a nerve leaving the cervical spine. There are eight pairs of
cervical roots, each consisting of two parts: the ventral (efferent motor) and the
dorsal (afferent sensory) root which unite to form a single spinal nerve. All cervical
nerves exit superiorly to their corresponding vertebrae with the exception of C8,
which exits inferiorly to the C7 vertebra.;