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19 Cards in this Set
- Front
- Back
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Tragus from ____ |
First arch.. Rest of pinna second arch |
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Incisura terminalis |
Juntn btw first and 2 nd arch.. No cartilage.. Lemoerts endaural incision.. Incomplete union of arvhes.. Pre auricular sinus |
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Pinna fully formed by |
5 months first 6 hillocks of his formed |
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Why sc fpr bat ear at 6 yrs |
Dvlpment of pinna completes by 6 yrs |
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First pouch and first cleft |
EAC form cleft and ET and Middle ear from pouch |
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Collaural fistula |
Floor of EAC to opening close to angle of mandible |
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Ossicles.. Cochlea.. And inner ear( pars sup and pars inf) dvloment series |
Malleus and incus: first arch. Stapes head: 2nd arch Foot process: neuro ectoderm( otic capsule) Cochlea: otic capsule Inner ear: neuroectoderm |
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Scheibes dysplasia |
Cochleo saccular dysplasia.. That is pars inferior dysplasia |
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Normal cocglea has ____ turns |
2 3/4 turns If 1 1/2 turn: mondinid dysplasia If no cochlea: michels aplasia |
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Stapes foot playe over |
Oval window of cochlea If fixed( otosclerosis) Conductive hearing loss Sx: stapedotomy/ ectomy Piston prosthesis used |
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Ossicular joint type |
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2 ratios in middle ear |
Lever and areal Lever: size of malleus to stapes: 1.3:1 Areal: TM:foot plate- 14:1 So total transformer ratio : 18:1 |
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Sensory supplybif ear |
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Boxers ear Mx |
Pinna hematoma/ sub perichondrial haemorrhage Aspirstion and pressure bandage If not necrosis of cartilage |
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Length of EAC |
24 mm 8 mm outer cartilage and 16 mm inner bony |
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Keratin and wax migration out of EAC absent ______ |
Keratosis obturans Rx: canalplasty |
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Natural fissures i EAC |
In outer cartilagenous: fissure of santorini In inner bony: fissure of huschke Remember wrisburg and Santorini |
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Narrowest part of EAC |
6mm lateral to TM |
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Nerve supply of EAC |
Pinna has 5 EAC has 3---> vagus, facial(wrisburg) and auriculotemp) |
