Pharmacology notes

Apr 15th, 2015
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F07088-p017-099.qxd 4/22/02 10:23 PM Page 8484SYSTEMS NERVOUS8TH CRANIAL NERVEThe eighth cranial (auditory) nerve hastwo components, the cochlear (responsible for hearing) and the vestibular(labyrinthine) responsible for balanceand appreciation of movement (Fig. 1).Membranous labyrinthCross-sectionthrough a cochlearcoilScala vestibuliCOCHLEAR ASPECTSVestibularNerve fibres from the Organ of Cortimembraneare rapidly joined by the vestibular nerve,Cochlear ducttravel through the facial canal, pass viathe internal auditory meatus into thecerebellopontine angle, and the cochlearVestibular nervefibres then enter the pons. Within theSpiral organpons, fibres cross the midline so thatCommunicateshearing from both ears can be integrated.across the midlineBasilarWard testing of hearing should bemembranecarried out in a quiet room and afterCochlear nerveinspection of the ear drum. Each ear isScala tympanitested separately whilst the other auditory meatus is occluded by a fingertip.Classically a ticking watch was used forthis test despite the fact that the pitch Fig. 1 The anatomy and simplified neurological connections of the ear.was higher than ideal, but because of theepidemic of digital watches, some otherNormal:Rinne positivestimulus such as the whispered voice has to be used. If aBilateral nerve deafness should have been excluded bypatient is deaf, and if the tympanic membrane is normal andtesting hearingunobstructed by wax,

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