1. anatomy of ear & mastoid
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Anatomy of Ear
& Mastoid
Dr. Vishal Sharma
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Embryology
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External ear: Pinna / auricle External auditory canal
Middle ear cleft: Eustachian tube
ym!anic ca"ity #middle ear$
Mastoid air cell system
%nner ear #labyrinth$: ochlea
Vestibule
Semicircular canals
Parts of ear
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External Ear
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External auditory canal
'( mm long) *ateral +/, artilaginous#- mm$:u!
bac medial. Medial '/, 0ony #+1 mm$:do2n
for2ard medial. Pinna !ulled u! bac lateral
to straighten external auditory canal.
3nly cartilaginous sin has hair follicles: furuncle
artilaginous fissure of Santorini& bony foramen
of 4usche: !assage of infection to and from
!arotidgland
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5er"e su!!ly of E.A..
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Middle ear cleft
onsists of:
Eustachian tube
ym!anic ca"ity #middle ear$
Aditus
Mastoid air cell system
De"elo!s from tubo6tym!anic recess
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Middle Ear
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ym!anic membrane
Pearly 2hite semi6translucent membrane
3bli7uely !laced at 889to floor
' !arts: !ars tensa and !ars flaccida
, layers of !ars tensa:outer e!ithelial middle
fibrous & inner mucosal
;ibrous layer disorgani
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im!ani or ettle drum
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3tosco!ic "ie2
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1. E!itym!anum:Bounded laterally by scutum + pars
flaccida & medially by bone above tympanic part of
facial nerve2. Mesotym!anum:Middle ear cavity lying opposite
pars tensa & bony tympanic annulus
3. 4y!otym!anum:Middle ear cavity below level of
bony tympanic annulus
4. Posterior tym!anum:Middle ear cavity beind
bony tympanic annulus
!. Anterior tym!anum or Pro6tym!anum:Middle ear
cavity in front of bony tympanic annulus
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>alls of middle ear
=oof:"egmen tympani# middle cranial fossa
;loor:$ugular bulb# carotid artery
Anterior:"ensor tympani# %" orifice# carotid artery
Posterior:ditus# fossa incudis# pyramidal eminence#
facial recess# sinus tympani
*ateral:"ympanic membrane# scutum
Medial:'romontory# oval window# round window#
lateral ())# facial nerve *tympanic part
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*ateral 2all
Membranous:
a. ym!anic membrane
0ony
a. *ateral attic 2all abo"e !ars flaccida #Scutum$
b. *ateral 2all of hy!otym!anum
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Posterior 2all
ditus ad antrum
,ossa incudis for sort process of incus
Bulge produced by lateral semicircular canal
'yramidal eminence for stapedius tendon
Bulge produced by vertical part of facial nerve
(inus tympani
,acial recess
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0oundaries:
- Su!erior:Ponticulus
- %nferior:Subiculum
- *ateral:Mastoid Segment of ;acial 5er"e
- Medial:Posterior semicircular canal
%t e"ades direct surgical "isuali
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Anterior 2all
horda tym!ani ner"e exits "ia canal of 4uguier
anal for tensor tym!anion to!
Eustachian tube o!eningbelo2
%nternal carotid arteryis related inferiorly
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t t f iddl
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ontents of middle ear
Air
, ossicles:malleus incus and sta!es
' muscles:tensor tym!ani & sta!edius
' ner"es:chorda tym!ani & tym!anic !lexus
Mucosal folds & ligaments
0lood "essels
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Eustachian ube
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Anatomy
,1 mmlong in adults
Directed anteriorly inferiorly & mediallyfrom
anterior 2all of M.E. forming angle of (89
2ith
hori
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P t
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Parts
*ateral +/,is bony
Medial '/,is fibro6
cartilaginous. ?unction b/2 ' !arts
is isthmusnarro2est
!art of Eustachian
ube.
Anatom of medial '/,rd
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Anatomy of medial '/,rd
artilage !late lies
!ostero6medially &
consists of medial
lateral laminaese!arated
by elastin hinge. ;ibrous
tissue 3stmann@s fat
!adlie antero6laterally.
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Adult "s hild # B yr$
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Adult "s. hild # B yr$
; ti
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;unctions
+. Ventilation & maintenance of atmos!heric
!ressure in middle earfor normal hearing
'. Drainage of middle ear secretions into
naso!harynxby muco6ciliary clearance
!um!ing action of Eustachian tube & !resence
of intra6luminal surface tension
;unctions
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;unctions
,.Protection of middle ear from:
- Ascending naso!haryngeal secretions due
to narro2 isthmus & angulation bet2een '!arts of E.. at isthmus
- Pressure fluctuations
- *oud sound coming through !harynx
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%nner Ear
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%nner 4air ells 3uter 4air ells
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,899 +'999
Single ro2 hree or four ro2s
;las6sha!ed ylindrical
Primarily afferent Primarily efferent
ransmit auditory stimuli Modulate inner hair cell
=esistant to damage Vulnerable to damage
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Vestibular 4air ells
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Vestibular 4air ells
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em!oral 0one
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MacE2en@s riangle
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g
Su!erior:su!ramastoid crest Anterior:!ostero6su!erior margin of bony
external auditory canal o!ening
Posterior:tangent dra2n to mid6!oint of
!osterior 2all of external auditory canal
ontains s!ine of 4enle
Mastoid antrum lies +'6+8 mm dee! to triangle
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rautmann@s triangle
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g0oundaries
(uperiorly6superior petrosal sinus
'osteriorly6sigmoid sinus
nteriorly6solid angle *semi7circular canals
'atway to posterior cranial fossa from mastoid
cavity & vice versa
Mastoid cells
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entral grou! Accessory grou!
Mastoid antrum S7uamous
Peri6antral 3cci!ital
Peri!heral grou! Styloid Dural Peri6tubal
Sino6dural ygomatic
Peri6sinus Petrous a!ex
i!
=etro6facial
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han ou
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