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.
Version 2.1 Facial Nerve Palsy 6/11/2013. Neuroanatomy. The VIIth cranial (facial) nerve is largely motor in function (some sensory fibres from external. acoustic meatus, fibres controlling salivation and taste fibres from the anterior tongue in the. chorda tympani branch).