Anatomy of the Ear
Anatomy of the Ear
Theear as you know it.gettyimagesDXKY.CNDXY.CN
The ear as you know it
Three parts of the earDXY.CN
Three parts of the ear
Anatomic SubdivisionsExternalEarauricle(pinna)andexternalauditorycanal Middle Ear (Tympanum)TympanicCavity-TM,ossicles,muscles,connectionto eustachiantubeInner Ear Mermbranous Labyrinth -cochlea, saccule, utridleand semicircular canals
Anatomic Subdivisions ◼ External Ear ◼ auricle (pinna) and external auditory canal ◼ Middle Ear (Tympanum) ◼ Tympanic Cavity – TM, ossicles, muscles, connection to eustachian tube ◼ Inner Ear ◼ Membranous Labyrinth – cochlea, saccule, utricle, and semicircular canals
EXTERNALEAR
EXTERNAL EAR
External Ear AnatomyAuricleHelixTriangularfossaBAntihelixHelixConchaCymba conchaeCrus ofAntihelixhelixTragusTragusConchaAntitragusLobuleLobule
External Ear Anatomy Auricle ◼ Helix ◼ Antihelix ◼ Concha ◼ Tragus ◼ Lobule
External Auditory Canal.2.5 cm long·Lateral1/3cartilaginous,hairy andceruminous glandsAuricleTemporal lobewhich secrete waxMastoidair cellsExternal auditoryTympanicSkin isthickmeatusmembrane·Medial2/3External auditoryBonycanal (medial)canalCartilaginousCeruminousnal (lateral)bonywithouthairsorglandsandductsHairs (vibrissae)ceruminous glandsSkin is thin
External Auditory Canal •2.5 cm long •Lateral 1/3 cartilaginous, hairy and ceruminous glands which secrete wax Skin is thick •Medial 2/3 bony, without hairs or ceruminous glands Skin is thin
MIDDLE EARgettyimagesDXYCN
MIDDLE EAR
Middle Ear AnatomySix WallsTympanicmembraneOssicles(three bones)MusclesNervesEustachian TubeMastoidMucosaciliated respiratorymucosawithgoblet cellsCuboid mucosa in mastoid
Middle Ear Anatomy ◼ Six Walls ◼ Tympanic membrane ◼ Ossicles(three bones) ◼ Muscles ◼ Nerves ◼ Eustachian Tube ◼ Mastoid ◼ Mucosa ◼ ciliated respiratory mucosa with goblet cells ◼ Cuboid mucosa in mastoid
Tympanic Cavity - The CubeBoundariesSuperior:tegmen tympaniInferior: air cells and bulb overAnterior: wall of carotid canal, tensor tympani muscle andcanal,eustachian tubeorificePosterior:pyramidal eminence, chorda tympani entrance,facial recess,facial canalMedial -promontory,facial ridgePosteriorLateral -TM,scutumSuperior/RoofMedialLateralAnteriorInferior/Floor
Tympanic Cavity - The Cube ◼ Boundaries ◼ Superior: tegmen tympani ◼ Inferior: air cells and bulb over ◼ Anterior: wall of carotid canal, tensor tympani muscle and canal, eustachian tube orifice ◼ Posterior: pyramidal eminence, chorda tympani entrance, facial recess, facial canal ◼ Medial - promontory , facial ridge ◼ Lateral - TM, scutum Medial Lateral Superior/Roof Inferior/Floor Anterior Posterior