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.
Here is a list of the cranial nerves and their general functions in order : Olfactory - smellOptic - visionOculomotor - eyeball movementTrochlear - eyeball movementTrigeminal â¦ - chewing and other face musclesAbducens - eyeball movementFacial - facial expressions and tasteAuditory - hearingGlossopharyngeal - muscles for swallowingVagus - internal ...