Cranial Nerve Info
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| What is the parasympathetic component of CN III? | Edinger-Westphal nucleus | |
| What is the parasympathetic component of CN VII? | Superior Salivatory nucleus | |
| What is the parasympathetic component of CN IX? | Inferior Salivatory nucleus | |
| What is the parasympathetic component of CN X? | Dorsal nucleus, Nucleus Ambiguus | |
| What brainstem nuclei are in the midbrain? | III Oculomotor: Occulomotor nucleus & Edinger-Westphal nucleus, IV Trochlear: Trochlear nucleus | |
| What brainstem nuclei are in the pons? | V Trigeminal: One motor, three sensory nuclei, VI Abducens: Abducens nucleus, VII Facial: Motor nucleus, Superior Salivatory Nucleus, Solitary nucleus | |
| What brainstem nuclei are in the medulla? | IX Glossopharyngeal: Nucleus Ambiguus, Solitary nucleus, Inferior Salivatory nucleus, X Vagus: Dorsal Motor nucleus, Nucleus Ambiguus, Solitary nucleus | |
| Explain the light reflex both direct and indirect/consensual. | Involves CN II & III, light into right eye = right pupil constricts = direct light reflex, light into right eye = left pupil constricts = consensual light reflex. | |
| Explain the accommodation-convergence reflex of the eye. | Involves CN II & III, accommodation results in a change in the shape of the lens and restriction of light entering pupil, convergence moves the eyes to focus on the near object. | |
| Explain the pathways for the corneal reflex. | CN V (Opthalmic Br.) --> synapse to spinal nucleus of CN V --> synapse to CN VII nucleus --> synapse to orbicularis oculi muscle --> quick closure of eye. | |
| Explain the pathways for the gag reflex. | Afferent is CN IX --> synapse to solitary nucleus, efferent is CN X --> synapse to nucleus ambiguus. | |
| Explain the pathways for the jaw jerk reflex. | CN V --> synapse to trigeminal mesencephalic nucleus --> synapse to trigeminal motor nucleus --> synapse to the masseter muscle. | |
| Explain the pathway of the pupillary light reflex. | Light strikes the retina & is transmitted through the superior colliculus-->1st synapse in pretectal nucleus-->2nd synapse with Edinger-Westphal nucleus and other pretectal nucleus through the posterior commissure-->neuron leaves Edinger-Westphal nucleus as parasym of CN III-->3rd synapse of CN III on cilary ganglion-->4th synapse of cilary ganglion to cilary muscles resulting in constriction of pupil. | |
| Explain the pathway of the accommodation-convergence reflex. | CN II signals lateral geniculate nucleus-->occipital lobe-->superior colliculus-->oculomotor & Edinger-Westphal nuclei-->oculomotor signals medial rectus muscle, Edinger-Westphal signals down CN III to cilary ganglion-->ciliary ganglion to cilary muscles constrict pupils. |
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