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12 Cards in this Set
- Front
- Back
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Olfactory Nerve |
CN1, Sensory, Bring smell impulses from nasal cavity, through ethmoid cribriform plate, synapses in olfactory bulb to olfactory tract, smell precessed in temporal lobe with the help of occipital lobe, nerves run along anterior base of brain. |
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Optic Nerve |
SN2, Sensory, transmits visual impulses from retina in back of eye, optic canal in sphenoid bone, some fibers cross at optic chasm, tptic tracts take information ultimately to occipital lobe, origin in retina, damage could make you lose all or some eyesight |
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Oculomotor nerve |
CN3, Motor, conveys impulses from midbrain to eye, *motor control to elevator palpebraie superior also to help to regulate pupil size and accommodation, parasympathetic innervation to lens and iris, damage will cause pupils to dilate, eyes will be closed |
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Trochlear Nerve |
CN4, Motor, Conveys motor impulses to eye muscles, innervates the superior oblique muscles, help us look down and out, only CN that starts posteriorly brainstem, *completely decussates controls opposite side, damage will result in the inability to rotate eyes |
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Trigeminal Nerve |
CN5, Sensory&Motor(mostly sensory), 3 separate branches, ophthalmic (S), Maxillary (S), Mandibular (M&S), eat and feel, most important sensory nerve of the face, *relays sensory information from the face and neck to the Pons |
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Abducens Nerve |
CN6, Motor, Lateral eye movement, travels in midline at the junction of Pons and Medulla, originates in the Pons |
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Facial Nerve |
CN7, Motor & Sensory (more motor), Major motor nerve of facial muscles, starts as nerve cluster anteriolater medulla, travels laterally between Pons and medulla, 5 branches (temporal, zygomatic, buccal, mandibular and crvicle), motor conveys impulses for facial expressions, also autonomic for tears, saliva, mucus, sensory tastes via tastebuds on anterior 2/3tongue to be interpreted in temporal lobe |
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Vetibulocochlear Nerve |
CN8, Sensory, runs posteriorly to facial nerve senses from inner ear to Pons to temporal lobe, vestibular component for equalibrium, chochlear impulse for hearing |
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Glossopharyngeal Nerve |
CN9, Sensory & Motor (very complex), Sensory taste from posterior tongue and pharynx, autonomic control of BP and respirations, sensations from taste buds and BP receptors to medulla/reticullar formation to be processed, Motor conveys impulses from Medulla to control swallowing salivation gagging |
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Vagus Nerve |
CN10, Motory & Sensory, most extensive distribution of all CN's head and neck, also viscera of thorax/abdomen/pelvis (heart, lungs, digestive tract urinary fx's) Sensory sensations from larynx, vessel, ear to be processed in Medulla, Motor controls movements to larynx, pharynx, thoracic and abdominal viscera, *major parasympathetic player, Motor portion starts in Medulla, Sensory portion starts in various places and both end in Medulla |
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Accessory Nerve |
CN11, Not a true CN, Motor, arises from upper spinal cord/medulla, enters the brain through foramen magnum, travels out of cranium bundles with CN9 and 10 fibers via jugular foramen, Motor controls movement of upper trapezius and sternocleidomastoid, helps also with swallowing |
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Hypoglossal Nerve |
CN12, Motor, control tongue movements, relates to speech, movement of food and swallowing, travels from Medulla toward midline, if damaged tongue will veer towards the ipsilateral side |
