Section2Middleear.liesbetweentheexternaland internalears·includes the tympanic cavity, auditory tube and mastoid cells·transmitsoundwaveinternalearexternalearmiddleear
• lies between the external and internal ears • includes the tympanic cavity, auditory tube and mastoid cells • transmit sound wave Section 2 Middle ear
I.Tympaniccavity·anirregularair-filledspacewithinthetemporal bone·contains the auditory ossicles,ligments,muscles and nerves· communicates with the nasopharynx anteriorly through the auditorytubeand withthe mastoid cells posteriorlythroughthe mastoid antrumexternalearmiddleearinternalear
Ⅰ. Tympanic cavity • an irregular air-filled space within the temporal bone • contains the auditory ossicles, ligments, muscles and nerves • communicates with the nasopharynx anteriorly through the auditory tube and with the mastoid cells posteriorly through the mastoid antrum
1.Wallsofthetympaniccavity(1) Lateral / membranous wall: is separted from extenal meatus by tympanic membrane(2) Superior / tegmental wall: separates the middle cranial fossa(3)Inferior/jugularwall:separatesthejugularfossaMiddlecranialfossa
(1) Lateral / membranous wall: is separted from extenal meatus by tympanic membrane (2) Superior / tegmental wall: separates the middle cranial fossa (3) Inferior / jugular wall: separates the jugular fossa 1. Walls of the tympanic cavity Middle cranial fossa
(4)Anterior/ carotidwall: separatesthe internal carotidA(5)Posterior/mastoidwall:isopenedintothetympanicantrumTympanicantrumTympaniccavityMastoidprocessICA
(4) Anterior / carotid wall: separates the internal carotid A. (5) Posterior / mastoid wall: is opened into the tympanic antrum ICA Tympanic antrum Mastoid process Tympanic cavity