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.
The 12 Cranial NervesâDetail. Cranial Nerve 1 Sensory nerve â Olfactory Nerve â controls sense of smell. Cranial Nerve 2 Sensory nerve- Optic Nerve- controls vision by sending information from retina. Cranial Nerve 3 Motor nerve- Oculomotor Nerve-Controls most eye muscles. Works closely with Cranial Nerves 4 & 6.