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