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MOB TCD

Professor Emeritus Moira OBrienFRCPI, FFSEM, FFSEM (UK), FTCD

Trinity Coe!e

Du"in

Ear

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E#terna Ear

$ %uri&e$ One t'ir &artia!inous

$ To t'irs "ony

$ Meia tym*ani&

mem"rane

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+aematoma of EarMOB TCD

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$ Roof s'orter t'an foor$ ine it' &oumnar e*it'eium

$ Ceruminous !ans

$ Otis e#terna (simmers ear)

$ Pain on *uin! o"ue

E#terna EarMOB TCD

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Tym*ani& Mem"rane

$ T'ree ayers$ Outer s-uamous

$ Mie fi"rous

$ Defi&ient su*eriory

$ Fa&&i in u**er *ortion

$ +ane of maeous

em"ee in fi"rous ayer

$ Inner mu&ous mem"rane

$ Con&a.e ateray

$ Um"o

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$ Set at an!e //0'ori1onta$ 2er.e su**y

$ 3reat auri&uar

$ Post inferior -uarant fa&ia

$ Tym*ani& "ran&' of!osso*'aryn!ea

$ Fa&ia ner.e

$ Boo su**y

$ Su*erior more .as&uar

Tym*ani& Mem"raneMOB TCD

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Mie Ear

$ Bi&on&a.e$ Roof4 te!men tym*ani

$ Foor4 "one se*arates it

from &aroti &ana

$ Tym*ani& "ran&' of!osso*'aryn!ea ner.e

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$ atera a$ Tym*ani& mem"rane

$ E*itym*ani& re&ess

$ Meia a

$ atera semi&ir&uar &ana

$ Cana fa&ia ner.e

$ Promontory

$ Tym*ani& *e#us

Mie EarMOB TCD

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Mie Ear %nterior 5a

$ Cana tensor tym*animus&e

$ O*enin! Eusta&'ian tu"e

$ %nterior o*enin! for &'ora

tym*ani ner.e$ Bone se*arates it from

&aroti &ana

$ Caroti&otym*ani& ner.es

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Mie Ear Posterior 5a

$ O*enin! mastoi antrum$ Pyrami

$ O*enin! for sta*eius

mus&e

$ Cana for fa&ia ner.e

$ Posterior o*enin! of &'ora

tym*ani

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Contents Mie Ear

$ %ir$ Ossi&es

$ Tensor tym*ani mus&e

$ Sta*eius mus&e

$ C'ora tym*ani

$ Fa&ia ner.e

$ Caroti&otym*ani& ner.es

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$ Maeous$ +ea, ne&6, 'ane,

anterior *ro&ess,

*osterior *ro&ess

$ In&us, "oy on! ans'ort *ro&ess

Mie EarMOB TCD

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Sta*es

$ Sta*es$ 2e&6

$ %nterior an *osterior

$ Foot *ie&e fits into

$ O.a ino

$ Sta*eius mus&es inserte

"a&6 of ne&6 of sta*es

$ Fa&ia ner.e

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Mie Ear

C'ora Tym*ani

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7oints

$ Syno.ia 8oints$ Ca*sue &onsists mainy of

easti& tissue

$ Transmits soun a.esfrom air to s&aa .esti"ui

$ Otos&erosis

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Eusta&'ian Tu"e

$ To t'irs &artia!inous$ One t'ir "ony

$ Meia forms tu"a ee.ation

in atera a naso*'aryn#

$ O*ens into anterior a ofmie ear

$ e.ator an tensor *aati

mus&es o*en Eusta&'ian

tu"e$ E-uaise *ressure on

tym*ani& mem"rane

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%uitory Pat'ay

$ Co&'ea$ Co&'ear ner.e

$ Co&'ear nu&ei

$ Centra auitory *at'ay

$ Corte# tem*ora o"e

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Co&'ea

$ 9 : turns

$ Moious &entra *iar

$ %#is of interna a&ousti&

meatus

$ S*ira amina

$ Basiar mem"rane

$ ;esti"uar mem"rane

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$ O.a ino$ S&aa .esti"ui

$ S&aa tym*ani

$ Se&onary tym*ani&

mem"rane$ Contain *eriym*'

$ S&aa meia or u&t of

&o&'ea enoym*'

Co&'eaMOB TCD

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S&aa Meia

$ Basiar mem"rane$ S*ira or!an

$ +air &es of or!an of &orti

$ Te&toria mem"rane

$ Sin!e ro of inner 'air&es

$ Ea&' one 'as 9< ar!e

afferent

$ Outer 'air &es

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Soun 5a.es

$ %uri&e$ E#terna ear

$ Tym*ani& mem"rane

$ Maeous, in&us, sta*es

$ O.a ino$ Pressure a.es in s&aa .esti"ui,

s&aa meia, s&aa tym*ani

$ Roun ino

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Co&'ea

$ Tra.ein! a.e t'eory$ o tones *ea6 at a*e#

$ +i!' tones at "ase

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%uitory 2er.e

$ Re&e*tors are 'air &es ofor!ans of &orti

$ Bi*oar &es

$ Ce "oies are in t'e s*ira

!an!ion on t'e$ S*ira amina

$ %uitory ner.e atta&'e to

oer "orer of *ons

$ Cere"ear=*ontine an!e

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%uitory Pat'ay

$ First orer neurones enon .entra an orsa&o&'ear nu&ei

$ On inferior &ere"ear*eun&e

$ 9n(orer neurones

$ Tra*e1oi "oy

$ atera eminis&us

$ Inferior &oi&uus

$ Su*erior oi.ary nu&eus

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$ Inferior &oi&uus$ ;ia inferior "ra&'ium

$ Meia !eni&uate "oy

$ >r(orer neurones

$ %uitory raiations to auitory&orte# in tem*ora o"e

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atera eminis&us

$ Fi"res arise from$ ;entra &o&'ear nu&eus

$ Dorsa &o&'ear nu&eus

$ Form atera emins&us

$ Su*erior oi.ary nu&eus

$ Mainy &ontra atera

$ Fi"res en in inferior &oi&ui

nu&ei "a&6 of mi"rain

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Su*erior Oi.ary 2u&eus

$ Re&ei.es in*uts from "ot'ears

$ Intensity an timin!

$ I*siatera are e#&itatory

an earier an moreintense

$ Contraatera in'i"itory .ia

nu&eus in tra*e1oi

$ Pro8e&ts to inferior &oi&ui

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Inferior Coi&ui

$ S*atia information$ Su*erior oi.ary nu&eus

$ Intensity from .entra &o&'ear

nu&eus

$ Pit&' from orsa &o&'earnu&eus

$ Pro8e&ts to meia !eni&uate

"oy

$ In'i"itory to o**osite &oi&uarnu&eus

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Meia 3eni&uate Boy

$ Meia !eni&uate "oy$ S*e&ifi& t'aami& nu&eus for

'earin!

$ aminate an tone to*i&

$ Fi"res *ro8e&t as auitoryraiations to *rimary auitory

&orte#

$ Su*erior tem*ora !yrus an

a8oinin! *art of insua

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%uitory RaiationsMOB TCD

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Primary %uitory Corte#

$ Tem*ora o"e$ +es&' !yrus

$ Posterior *ortion 'i!'

tones

$ %nterior o tones$ Biatera re*resente

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Primary %uitory Corte#MOB TCD

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%uitory Refe#es

$ %uitory to motor nu&eus of/t'an ?t'

$ Contra&tion of tensor

Tym*ani an sta*eius

$ Dam*en .i"rations$ %uitory to reti&uar nu&ei

arousa

$ Conne&t to fa&ia

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Deafness

$ Conu&tion$ E#terna

$ Mie

$ Inner ear

$ 2er.e eafness

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Position of Boy in S*a&e

$ ;isua system

$ T'e &ons&ious *ro*rio&e*ti.e

system

$ ;esti"uar system

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;esti"uar %**aratus

$ Bony a"yrint'$ Bony &o&'ea

$ ;esti"ue

$ Bony semi&ir&uar &anas

$ Contain *eriym*'$ Communi&ates it' CSF

$ Su"ara&'noi s*a&e

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$ Mem"ranous a"yrint'

$ Su*erior an *osterior&ommon o*enin! at nonam*uary en

$ atera semi&ir&uar &anas

$ Fi.e o*enin!s into utri&e$ Enoym*'ati& u&t

$ Sa&&ue

$ Du&tus reuiens

$ Du&t of &o&'ea$ Contain enoym*'

;esti"uar %**aratus

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;esti"uar Re&e*tors

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Re&e*tors

$Sensory stati& re&e*tors inma&ua of t'e utri&e an sa&&ue

$ Cristae of t'e am*uae are t'e

en or!ans of t'e ynami&

mo.ement semi&ir&uar &anas

$ Ma&uae res*on to inear

a&&eeration of 'ea in 'ori1onta

or .erti&a *ane urin! a6in!

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$ +air &es are foun in t'e

ma&ua is&'ar!e a t'e time

$ Ciia on t'e 'air &es em"ee

in !eatinous su"stan&e

&ontainin! &a&ium &ar"onate

&rystas

Re&e*tors

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;esti"uar Pat'ay

$ Ce "oies are in t'e.esti"uar !an!ion in t'e

interna a&ousti& meatus

$ Reay in .esti"uar nu&eus

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$ ;esti"uar nu&eus to&ontra atera

$ ;entra *osterior nu&eus

of t'aamus

$ Be'in fa&e area ofsomato=sensory &orte#

;esti"uar Pat'ay

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$ atera .esti"uos*ina tra&tarises from atera or Deitersnu&eus

$ Des&ens in anterior &oumnof same sie

$ Syna*se on anti=!ra.itymotor neurones

$ %&ti.e urin! a6in!

$ %nti!ra.ity in utri&e

$ Free fa sa&&ue

;esti"uar Pat'ay

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$ Meia .esti"uo=s*ina

$ Des&en "iateray

$ Meia on!ituina Fas&i&uus

(MF) to &er.i&a &or

$ +ea ri!'tin! refe#$ Eye ri!'tin! refe#

$ %rise from atera .esti"uar

nu&eus

$ E#tra o&uar nu&ei

;esti"uar Pat'ay

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$ %fferents from t'e &ristae en

in meia an su*erior

.esti"uar nu&ei

$ To ay &onne&tion it'

$Fo&&uo nouar o"e to a.esti"uar nu&ei

;esti"uar Pat'ay

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;esti"uar Pat'ay

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;esti"uar Pat'ay

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;esti"uo=O&uar Refe#es

$ Ri!'tar 'ea turn a&ti.atesin t'e ri!'t atera semi&ir&uar

&ana

$ Resutin! in &ontra&tion of eft

atera re&tus an ri!'t meia

re&tus

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$ Uner &ere"ear !uian&e

$ Ri!'t meia .esti"uar

nu&eus

$ Res*ons to ri!'tar 'ea

turn$ Im*use to o**osite *ara

meian re!ion

$ Meia re&tus

;esti"uo=O&uar Refe#es

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2ysta!mus

$ +ori1onta .esti"uo=o&uarrefe#

$ Fast an so *'ase

$ Cae after fast *'ase

$ 2ysta!mus a&&om*anie "y.erti!o

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Corti&a Eye Fies

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