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 XII: The Hypoglossal Nerve Stemming from between the gracile and cuneate fasciculus, this nerve exits the skull via the hypoglossal canal. It motorically innervates the muscles of the tongue, except the palatoglossus, which is innervated by the vagus nerve (CN X).he 12 Cranial Nerves. There are twelve Cranial Nerves that supply the head, neck and internal organs. Here you can find a structured list of the nerves in numerical order, which includes their position, exit from the skull, what each nerve supplies and whether it is a motor or sensory nerve.