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organ of hearing (vestibulocochlear organ)
external ear, the middle ear or tympanic cavity, the internal ear or labyrinth
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External ear auricula or pinna, and the external acoustic meatus.
External Acoustic Meatus cartilaginous portion osseous portion The Tympanic Membrane It is a thin, semitransparent membrane 1. Tympanic membrane. 2. Umbo. 3. Handle of the malleus. 4. Lateral process. 5. Pars flaccida.
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Middle ear tympanic cavity auditory tube mastoid sinus mastoid cell
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Tympanic cavity Wall superior-Tegmental Wall infeiior-Jugular Wall
anterior-carotid wall posterior-mastoid wall lateral-Membranous medial –Labyrinthic wall internal structure Auditory Ossicles malleus, incus, stapes.
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Auditory tube tympanic cavity communicates with the nasal part of the pharynx The tube is opened during deglutition . It is formed partly of bone, partly of cartilage and fibrous tissue
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mastoid sinus and cells
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internal ear Labyrinthus osseus Labyrinthus membranaceus;
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labyrinthus osseus vestibule, semicircular canals cochlea
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The Semicircular Ducts The Ductus Cochlearis
Membranous labyrinth The Utricle The Saccule (macula acustica ) The Semicircular Ducts (crista ampullaris ) The Ductus Cochlearis (spiral organ of Corti )
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conduction of sound
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