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Pinna (auricle) landmarks
helix, lobule, antihelix, antitragus, tragus concha


major function of pinna (auricle)
localization of a sound in space, collecting sound, most efficient at delivering high frequency sounds


external auditory meatus outer border
concha


external auditor meatus inner border
tympanic membrane


EAM is lined with
epithelial tissue
glands produce cerumen


outer 1/3 of EAM passes through?
cartilage


inner 2/3 of EAM passes through?
tympanic portion of temporal bone

what is otitis extrema?
cerumen build up that causes infection in the ear
osseocartliganous joint?
where the cartilage and bone portion come together in the EAM

tympanic membrane
boundary between the outer and middle ear


tympanic membrane is composed of three layers
external layer, intermediate layer, and inner (mucous) layer


umbo
depressed part of cavity attached to middle ear (manubrium of malleus shows through)


pars tensa and pars flaccida
pars tensa and pars flaccida


anterior/posterior malleolar fold
anterior/posterior malleolar fold


cone of light
cone of light
