Cranial. Definition

Medical Definition: cranial

Nerves that originate apparent in the brain stem and out through some of the holes in the skull base. There are nine numbered in order rump with Roman numerals from III to XII. The first two cranial nerves, olfactory and optic, are not properly cranial nerve tracts but, as both the olfactory bulb and the retina, from where are brain vesicles. The names of the twelve cranial nerves are: I, olfactory; II, optical, III, oculomotor, IV, trochlear, V, Trigeminal, VI, abducens, VII, facial, VIII, statoacoustic, IX, glossopharyngeal; X , vague, XI, accessory or cord; XII, hypoglossal.

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