Anatomy · Neuroanatomy

Cranial nerves: functional components and major clinical correlations

8 min read

  • Cranial nerves: 12 paired nerves arising from the forebrain (I, II) and brainstem (III to XII).
    • Each carries one or more of seven functional components that parallel the spinal cord's motor and sensory columns.
  • In rostrocaudal order:
    • I Olfactory
    • II Optic
    • III Oculomotor
    • IV Trochlear
    • V Trigeminal
    • VI Abducent
    • VII Facial
    • VIII Vestibulocochlear
    • IX Glossopharyngeal
    • X Vagus
    • XI Accessory
    • XII Hypoglossal

Functional Columns and Classification of Cranial Nerves

  • Morphological classification:
    • Nerves to myotome-derived muscles: III, IV, VI, XII.
    • Nerves to branchial-arch-derived muscles: V, VII, IX, X, XI.
    • Nerves of special sense organs: I, II, VIII.

Seven functional columns of cranial nerve nuclei