Middle Ear Anatomy - WallsFloor:A thin plate of boneAnteriorly -Boneoverlying jugular bulbSeparatetympanic cavityfrom jugular bulbCanbe deficient,maybeonlymucosa
Middle Ear Anatomy - Walls ◼ Floor: ◼ A thin plate of bone ◼ Anteriorly – Bone overlying jugular bulb ◼ Separate tympanic cavity from jugular bulb ◼ Can be deficient, maybe only mucosa
Middle Ear Anatomy - Walls鐘骨足板外半规管凸面神经管凸Anterior Wall:匙突鼓爽入口大脑颗叶锥降起Inferiorly-Internal Carotid鼓索神经孔面神经、散姆Artery砧骨一A thin plate bone abovethe一鼓膜张肌半管锤骨鼓膜张肌附着处internal carotid artery canal咽鼓管鼓口鼓索神经Two opening:鼓膜the upper one-颈内动脉tensortympani muscle蜗窗小窝the lower one颈静脉球eustachiantube orifice图5-1-10鼓室六壁模式图（右）
Middle Ear Anatomy - Walls ◼ Anterior Wall: ◼ Inferiorly – Internal Carotid Artery ◼ A thin plate bone above the internal carotid artery canal ◼ Two opening: ◼ the upper one - tensor tympani muscle ◼ the lower one - eustachian tube orifice
Middle Ear Anatomy - WallsPosterior Wall:ChordatympaninervePyramidalEminence(bonyLongcrusofincusStapesinovalattachmentof StapediusTendon)(vestibular)windowChordal Eminence(ridge andLateral processofmalleusforamen where chorda tympaniTendonoftensortympanientersmiddleearmuscleManubriumFacial Recess(depressionboundedofmalleusbyaboveeminences,facialnervePromontorylaterallyand shortprocessof incusTendon of stapediusmusclesuperiorly.Fossaofround(cochlear)windowEpitympanumsuperiortoincusViewintotympaniccavityafteropensinto mastoidantrumremovaloftympanicmembrane
Middle Ear Anatomy - Walls ◼ Posterior Wall: ◼ Pyramidal Eminence (bony attachment of Stapedius Tendon) ◼ Chordal Eminence (ridge and foramen where chorda tympani enters middle ear） ◼ Facial Recess (depression bounded by above eminences, facial nerve laterally and short process of incus superiorly. ◼ Epitympanum superior to incus opens into mastoid antrum