Cranial nerve1 - Cranial nerves This note covers the...

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Cranial nerves This note covers the cranial nerves, their anatomy and problems that may arise The cranial nerves CNI: Olfactory o Nuclei: Frontal lobe (forebrain) o Special Sensory: Smell o Components: Sensory cells in mucosa (also bipolar cell): Sensory cell is 1st order neurone Synapse with 2nd sensory neurone in olfactory bulb on inf. part of frontal lobe (brain) Travel to olfactory nuclei in brain o Path of nerve: Goes thro’ cribiform plate of ethmoid bone in roof of nose CNII: Optic o Nuclei: Forebrain (Edinger-Westphal) o Special Sensory: Vision o Components: Sensory cells (Rods & Cones) Primary sensory neuron (bipolar) Secondary sensory neuron (axon forms optic nerve) o Path of nerve: Leaves back of eye/orbit via optic canal (sphenoid bone) ---- Middle cranial fossa Joins contralateral CNII to form optic chiasm above pituitary; ½ fibres cross midline 2 optic tracts leave chiasm to lateral geniculate nucleus
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