THE EAR(Page 154)

Dr.Sherif Fahmy

A- External EarDr.Sherif Fahmy

Dr.Sherif Fahmy

Auricle

Lobule

External auditory meatus

Ear drum

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Auricle

Lobule of ear

External auditory meatus

Ear drum

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Tympanic memebrane (Ear drum)

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Tympanic membrane

External auditory meatus

Malleus

Middle ear

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Pars tensa

Pars flaccida

Cone of light

Handle of malleus

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Tympanic membrane

Malleus

Middle ear

Umbo

Handle of malleus

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Blood & Nerve Supply of Tympanic Membrane

• 1- Nerve Supply:• A- Outer surface: is supplied by auriculo-

temporal and auricular branch of vagus.• B- Inner surface: tympanic plexus.• 2- Blood Supply:• 1- Outer surface: deep auricular artery.• 2- Inner surface: from anterior tympanic

artery. Dr.Sherif Fahmy

Dr.Sherif Fahmy

Outer aspect of tymoanic membrane

Handle of malleus

Cone of light Dr.Sherif Fahmy

Otitis media

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B- Middle Ear(Page 156)

Dr.Sherif Fahmy

Epitympanic recess

Tympanic cavity

Parts of middle ear cavity

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Roof

Floor

Anterior wall

Posterior wall

Medial wallWalls of middle ear

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Tegmen tympani

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Roof

Tegman tympani

Floor

Int. jugular vein

Tympanic br. Of Glosso-pharyngeal n.

Roof & Floor

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Anterior wall

Posterior wall

Promontory

Tympanic plexus

Oval window

Round window

Br. From sympathetic plexus around I.C.A.

Tympanic br. Of 9th CN

Canal for facial N.

Medial wall

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Roof

Floor

Anterior wall

Posterior wall

Tensor tympani m.

Auditory tube

Internal carotid art.

Sympathetic plexus

Anterior wall

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Aditus ad antrum

Pyramid

Facial canal

Chorda tympani

Posterior wall

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External auditory meatus

Ear drum

Lateral wall

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Contents of middle ear1- Ossicles: Malleus, incus and stapes.2- Muscles: Tensor tympani & Stapedius.3- Nerves: Tympanic plexus and chorda tympani.4- Blood vessels: Tympanic arteries.

Dr.Sherif Fahmy

Malleus

Middle ear

Incus

Stapes

Ossicles

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MalleusIncus

Stapes

Ossicles Head

Handle

Body

Long process

HeadNeck

Limbs

Foot plate

Short process

Anterior process

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Pharyngo-tympanic tube

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Middle ear

Lateral wall of naso-pharynx

Pharyngo-tympanic tube

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Dr.Sherif Fahmy

Opening of pharyngeotympanic tube

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Inner Ear(Page 160)

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Internal acoustic meatus

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Petrous Semicircular canals

Vestibule

Cochlea

Bony labyrinith

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saccule

UtricleCochlear duct

Semicircular ducts

Endolymphatic duct

Membranous labrynith

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Vestibulo-cochlear Nerve

(Page 160)Dr.Sherif Fahmy

Vestibular nerve

Cochlear nerve

Internal auditory meatus

Vestibulo-cochlear nerve

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Vestibular ganglia

Vestibular nerve

Spiral ganglia

Cochlear nerve

Vestibulo-cochlear nerve

Internal auditory meatus

Ponto-cerebellar angle

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Transmission of sound

Tympanic membrane

Malleus

Incus

Stapes

Oval window

Round window closed with 2dry tympanic membrane

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Spiral gangliom

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Applied Anatomy1- Otitis media.2- Intracranial injury of facial n.

-At internal auditory meatus.-At medial wall of middle ear.

3- High tone deafness.Dr.Sherif Fahmy