Cranial Nerves

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  1. Inferior frontal lobe
    CN I Olfactory
  2. Diencephalon
    CN II Optic fibers
  3. Anterior midbrain
    CN III Oculomotor
  4. Posterior midbrain
    CN IV Trochlear
  5. Lateral pons
    CN V Trigeminal
  6. Between pons & medulla
    • CN VI  Abducens
    • CN VII Facial
    • CN VIII Vestibulocochlear
  7. Medulla
    • CN IX Glossopharyngeal
    • CN X Vagus
    • CN XI Spinal accessory (medulla AND spinal cord)
    • CN XII Hypoglossal
  8. Moves tongue
    CN XII Hypoglossal
  9. Elevates shoulders
    CN XI Spinal Accessory
  10. Turns head
    CN XI Spinal Accessory
  11. Viscera
    CN X Vagus
  12. Hearing
    CN VIII Vestibulocochlear
  13. Speech
    CN X Vagus
  14. Eyes up/down
    CN III Oculomotor
  15. Raises eyelid
    CN III Oculomotor
  16. Eyes down and out
    CN IV Trochlear
  17. Abducts eye
    CN VI Abducens
  18. Tears
    CN VII Facial
  19. Facial expression
    CN VII Facial
  20. Facial sensation
    CN V Trigeminal
  21. Speech
    CN X Vagus
  22. Constricts pupil
    CN III Oculomotor
  23. What are the 3 branches of the trigeminal nerve?
    • Opthalmic
    • Maxillary
    • Mandibular
  24. Chewing
    CN IV Trigeminal
  25. TMJ Sensation
    CN IV Trigeminal
  26. What are the 3 trigeminal nuclei and what are their functions?
    • Mesencephalic (midbrain) - proprioceptive
    • Main sensory (pons) - discriminative touch
    • Spinal (medulla) - fast pain and temperature
  27. The labyrinth consists of the _____ and the _____.
    • Vestibular apparatus
    • Cochlea
  28. From the cochlear nuclei, auditory information is transmitted to what three structures?
    • Reticular formation
    • Inferior colliculus
    • Medial geniculate body
  29. What is the purpose of the reticular formation?
    Activating effect of sounds on the entire CNS. Ex) Loud sounds can rouse a person from sleep.

    Organ of corti > cochlear nerve > reticular formation > activates entire nervous system
  30. What is the purpose of the inferior colliculus?
    Integrates auditory information from both ears to detect the location of sounds. Elicits movement of eyes and head toward the sound.

    Organ of corti > cochlear nerve > inferior colliculus > superior colliculus > orienting eyes and head toward sound
  31. What is the purpose of the medial geniculate body?
    Serves as a thalamic relay station for auditory information to the primary auditory cortex, where sounds reach conscious awareness.

    Organ of corti > cochlear nuclei > medial geniculate body > primary auditory cortex > conscious hearing
  32. Taste - posterior tongue
    CN IX Glossopharyngeal
  33. Taste - anterior 2/3 tongue
    CN VII Facial
  34. Gag reflex
    CN X Vagus
  35. What are the three stages of swallowing?
    • Oral
    • Pharyngeal/laryngeal
    • Esophageal
  36. Which CNs contain LMNs?
    • I
    • II
    • III
    • IV
    • VI
    • VII
    • VIII
    • IX
    • X
    • XI
    • XII

    (All but I, II, VIII because those are just sensory)
  37. Diplopia is caused by a lesion in what CN?
    Diplopia (double vision) is caused by a lesion in the OCULOMOTOR NERVE
  38. What is the pupillary reflex?
    Pupil constricts when light is shined into eye.
  39. What is the consensual reflex?
    Pupil of eye constricts when light is shined into the opposite eye.
  40. What are the motor and sensory CNs for the gag reflex?
    • Motor (efferent) - Vagus
    • Sensory (afferent) - Glossopharyngeal
  41. Axons of the optic nerve synapse in which
    region of thalamus?
    Optic nerveaxons synapse in the lateral geniculate of thalamus and the pretectal nucleus in the midbrain (for the pupillary and consensual reflexes).
  42. What is the function of the ciliary muscle? Where does it synapse?
    Increases curvature of the eyes - synapses in the ciliary ganglion (parasympathetic)
  43. Adjustments of the eye to view near objects is called what?
    Accommodation - the pupils constrict, the eyes diverge (adduct), the lens becomes more convex. Motor innervation by oculomotor nerve.
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Cranial Nerves
Cranial Nerves
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