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Neuro II- CN VII
Thomadaki Fall 2010
Question | Answer |
---|---|
Origin of CN VII | - Facial nucleus [motor]/ lower pons facial colliculus - Nucleus of solitary tract [taste & parasympathetic] - Superior salivatory nucleus [parasympathetic] |
What forms the Nervous Intermedius? | Preganglionic parasympathetic fibers from facial nuclei + central axons of geniculate ganglion (taste from ant 2/3 of tongue) |
Exit of CN VII | Cerebellopontine angle |
Peripheral branches of CN VII | Temporal, Zygomatic, Buccal, Marginal mandibular, Cervical |
Motor function of CN VII | Muscles of facial expression, auricular muscles, stapedius, posterior belly of digastric, stylohoid muscles |
Sensory function of CN VII | Taste from anterior 2/3 of tongue via chorda tympani (peripheral axons of geniculate ganglion) which joins the lingual nerve (V3) |
Parasympathetic function of CN VII | Para to lacrimal, serous & mucous glands of nasopharynx & the submandibular, sublingual salivary glands (also via chorda tympani) |
Exam for CN VII | Facial expression movements & taste |
Lesion to CN VII | Bell's Palsy LMN type of facial paralysis [hyperacousis, unilateral facial paralysis w/ inability to wring the forehead, raise eyebrow, shut eye tightly, smile; tear flow over sagging lower eyelid & loss of taste from anterior 2/3 of tongue |
CN VII enters the _________ & ultimately exits the skull via the ________ | internal acoustic meatus; stylomastoid foramen |