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.
Finally, the abducens nerve is responsible for moving each eye temporally â or away from the nose. A problem with the sixth nerve results in double vision on looking at distant objects. Figure 3 â Two eyes and a nose and arrows showing how the 3 rd, 4 th, and 6 th cranial nerves move the eyes as described above.