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6 Cards in this Set
- Front
- Back
CN V Trigeminal
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3 branches responsible for sensory and motor innervations:
sensory: motor: innervate muscles of mastication & biting & tensor tympani muscle to adjust tension of typmanic membrane to increase sensitivity to soft sounds |
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CN VII Facial
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sensory and motor components.
sensory: taste in front 2/3 portion of tongue, sensation of the external ear motor: innervates autonomic parasympathetic functions of salivation & lacrimation, and inntervates facial expression muscles, stupedius muscle of middle ear to dampen loud sounds Damage: If corticobulbar nerve controlling the facial nerve is cut the lower 2/3 of contralateral face will be paralyzed (UMN lesion). If facial nerve is cut the whole ipsilateral half of the face is paralyzed (LMN lesioni.e., Bell's Palsy). |
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CN VIII Vestibulocochlear
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sensory only responsible for hearing & balance through distict pathways
auditory pathway: cochlear nucleas:cochlear nerve: internal acoustic meatus:cochlear (spiral) ganglion: cochlea hair cells vestibular pathway: vestibular nucleus: vestibular nerve: internal acoustic meatus: vestibular ganglion: utricle, saccule, ampulla hair cells |
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CN CN IX Glossopharyngeal
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sensory & motor components.
sensory: taste & sensation for the back 1/3 of tongue and back of tongue & oral cavity (pharynx, soft palate) motor: controls muscles associated with swallowing, speech & salivation. Innervates stylopharyngeus & helps elevation of pharynx for speech & swallowing Damage: UMN lesion nothing clinically evident due to bilateral input from coricobulbar nerve that deccusate vs. LMN lesion will result in difficulty with swallowing/speech |
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CN X Vegus
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sensory & motor components. works in combination with glossopharyngeal nerve
sensory: taste, sensation of external ear, canal & TM, pharynx, larynx, trachea, esophagus, & vicera motor: innervate larynx, pharynx (palatal arches & uvula) & viscera, & aids in phonation, swallowing & elevates palate Damage: UMN lesion the contralateral (opposite side) is affected) vs. LMN lesion ipsilateral side affected & probs. w/ swallowing, speech & breathing will be evident. Therefore the uvula will defiate to INTACT side due to the weak muscles not being able to pull on their side to center the uvula |
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CN XII Hypoglossal
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motor only responsible for tongue movement
Damage: lesion tongue deviates to Damaged side |