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.
cranial nerve V function. trigeminal nerve, has both sensory and motor components. it is the main sensory nerve to the head, relaying sensation of touch, pain, and temperature. - alpha motor neurons innervate and control muscles required for mastication.