Cranial Nerves 1 Cranial Nerve Olfactory Function Smell information Location of cell bodies thalamus 2 Optic Visual information 3 Occulomotor Controls eye movements Thalamus small branch synapses on the superior colliculus midbrain 4 Trochlear Controls eye movements midbrain 5 Trigeminal pons 6 Abduces Feeling to face Controls chewing muscles Suicide nerve – tumors of Schwann cells that wrap this nerve, or demyelination due to MS lead to a very painful disease with poor treatment Controls eye movements 7 Facial 8 Vestibulocochlear (auditory) 9 Glossopharyngeal 10 Vagus 11 Spinal Accessory Primary nerve that moves face Taste Speech (moves lips) Swallowing Bell’s palsy – due to infection or temporary demyelination of this nerve, can’t move side of face contralateral to affected nerve Hearing Balance Swallowing Taste Speech (controls muscles of the pharynx) Sends peripheral info to autonomic NS Controls breathing rate, heart rate, blood pressure, gut function Lesions to this nerve lead to death Moves shoulder muscles 12 Hypoglossal Moves tongue pons Junction of pons & medulla Synapses in inferior colliculus (midbrain) medulla medulla upper cervical portion of the spinal cord medulla Mneumonic: On Old Olympus’ Towering Top A Finn And German Viewed A Hop Brainstem lesions Lesions Midbrain Pons Medulla Defects Eye movement Auditory SN produces DA – cells die in Parkinson’s Feeling/moving face Auditory pathways Coma (because reticular activating system involved in brain arousal is located here) Death – because vagus nerve synapses here (involved in BP, HR, etc)

Recitation 6: Cranial Nerves, Brainstem Lesions (Cheat Sheet)

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