Definition of COUNTERBORE. : to form a counterbore in: enlarge (part of a hole) by means of a counterbore.ADVERTISEMENT.efinition of COUNTERBORE. 1. : a flat-bottomed enlargement of the mouth of a cylindrical bore. 2. : a drill for making a counterbore â compare countersink.
The vestibulocochlear nerve (auditory vestibular nerve) , known as the eighth cranial nerve, transmits sound and equilibrium (balance) information from the inner ear to the brain.
vestibulocochlear. pertaining to the vestibule of the ear and the cochlea. vestibulocochlear nerve the eighth cranial nerve, which emerges from the brain between the pons and medulla oblongata, behind the facial nerve.The vestibular division serves the vestibule of the ear and the semicircular canals, carrying impulses for the sense of equilibrium.estibulocochlear. pertaining to the vestibule of the ear and the cochlea. vestibulocochlear nerve the eighth cranial nerve, which emerges from the brain between the pons and medulla oblongata, behind the facial nerve.