Superficial nucleus terminates for deep sensation

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superficial nucleus terminates for deep sensation -cross leminiscus medialis -> thalamus opticus (3rd neuron) ant 2/3 of post limb of capsula int - corona radiata -lower part of post central gyrus lesions : -flaccid weakness of muscles of mastication -trigeminal neuralgia(pain when ouching face) - examination : we check fundus of nerve by passing a cotton wool followed by needle on -on cheeks -on forehead
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31 describe in detail the anatomy of facial nerve (nuclei branvhes area of innervation) methods used for assessment of its function and signs of lesion differential diagnosis of central and peripheral facial palsy anatomy : emerge from brainstem -controls muscles of facial expression -intermediate nerves -> gustatory :innervates to ant 2/3 of tongue -> salivatory : submandibular and sublingual glands -> lacrimatory :lacrimal glands nuclei : motor part arise from fromfacial nerve nucleus in pons *upper part receives corticonuclear tract from precentral gyrus of uooer facial muscles ( both sides ) *lower part on contralateral part lower facial muscles (one sied) branches : out of brain , facial and intermediateand go to int acoustic meatus where they enter facial canal and give branches -greater petrosal n -stapedius nerve - chorda tympani assessment : define assymetry , flatness of frehead, naso labial fold -patient asked to lift up eyebrows , frown , close eyes , wrinkle nose , show teeth disorders : -palsy of mimic muscles -foville syndrome -alternating syndromes -in damage of n.petrosis -> keratosis -loss of taste in ant 2/3 of tongue facial palsy : central -suffer muscles of lower tract of face on opposite side peripheral : suffer muscles of whole face halh on the same side and in case of damage of muscle of nuclei leads to fasciculation 32 describe in details anatomy of vestibulo-cochlear nerve and methods used for the assessment of it's functons cranial nerve 8 -sound waves are vibration : vibrations ar transmitted along ext auditory canal to the ear drum -spiral ganglion contains bipolarand unipolar neurons have central and peripheral processes central forms cochlear nerve peripheral receive inputs from hair cells -cochlear nerve : formed by central processof spiral ganglion cells (1st neuron) pass along int auditory canal with vestibular n. transverse subarachnoid space then enters the brainstem in cochlear nucleus fibers of cochlear n. split into 2 branches then each proceed to ventral ?dorsal nucleus(2nd neuron) -> axon derived from ventral cochlear nucleus , cross midline within trapezoid body and others proceed to sup. nucleus then to inf, calculi -axons derived from dorsal cochlear nucleus cross midline behind inf cerebellar peduncle next neuron in the pathway proceed to medial geniculate body and thalamus to posterior limb of inf capsule to cortex assessment : rhinne test : we pass a vibrating fork on the mastoid process and notice when the patient will stop hearing the vibration
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-webber test : audiometry : measure hearing acuity signs of lesion : hearing problems * conductive disorders in middle ear
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  • Winter '18
  • Jane doe

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