Applied Anatomy of EAR
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Transcript of Applied Anatomy of EAR
Applied Anatomy of Applied Anatomy of EAREAR
External EarExternal Ear
What type of cartilage Pinna is made What type of cartilage Pinna is made up of ?up of ?
ElasticElastic HyallineHyalline
What is the length of Ext Auditary What is the length of Ext Auditary Meatus [How deep is the TM]?Meatus [How deep is the TM]?
1 inch1 inch 1.5 inches1.5 inches 2 inches 2 inches
Tympanic MembraneTympanic Membrane
The size of TM isThe size of TM is
1x0.5 cm1x0.5 cm 1x1cm1x1cm 1x0.8 cm1x0.8 cm
How far is TM from external opening of the How far is TM from external opening of the earear
1 inch1 inch 1.5 inches1.5 inches 2 inches2 inches
How thick is TM ?How thick is TM ?
Approx 1 mmApprox 1 mm Approx 0.5 mmApprox 0.5 mm
TM lies at TM lies at
At Right angle to the External At Right angle to the External Auditary MeatusAuditary Meatus
ObliquelyObliquely
SummarySummary
Bulk of Ear is embedded in Temporal Bulk of Ear is embedded in Temporal bonebone
Ear consists of 3-parts: Ext Ear, Middle Ear consists of 3-parts: Ext Ear, Middle Ear and Internal EarEar and Internal Ear
External ear consists of PINNA and EAMExternal ear consists of PINNA and EAM EAM is 1-inch long and S-shaped and is EAM is 1-inch long and S-shaped and is
closed by TM at the other endclosed by TM at the other end Middle Ear lies next to TMMiddle Ear lies next to TM
Middle contains Ossicles [Malleus,Incus and stapes] Middle contains Ossicles [Malleus,Incus and stapes] which transmit sound to Internal earwhich transmit sound to Internal ear
In addition to Ossicles , FACIAL NERVE passes through In addition to Ossicles , FACIAL NERVE passes through itit
Middle Ear is filled with AIR ;Eustacean tube maintains Middle Ear is filled with AIR ;Eustacean tube maintains the Air pressure connecting it to Ext Atomospherethe Air pressure connecting it to Ext Atomosphere
Internal ear lies protected in petrous part of Temporal Internal ear lies protected in petrous part of Temporal BoneBone
It consists of COCHLEA [ for hearing] and LABARYNTH It consists of COCHLEA [ for hearing] and LABARYNTH for Balance; Vestibulo-cochlear nerve transmits sound for Balance; Vestibulo-cochlear nerve transmits sound and balance information to Brain Stemand balance information to Brain Stem
MASTOID is the bony prominence just behind Ext Ear.MASTOID is the bony prominence just behind Ext Ear.