organ of hearing (vestibuloc ochlear organ) • external ear, • the middle ear or tympanic cavity, • the internal ear or labyrinth
Jan 21, 2016
organ of hearing (vestibulocochlear organ)
• external ear,
• the middle ear or tympanic cavity,
• the internal ear or labyrinth
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.
Middle ear
• tympanic cavity
• auditory tube
• mastoid sinus
• mastoid cell
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.
Auditory tubetympanic 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
mastoid sinus and cells
internal ear
• Labyrinthus osseus
• Labyrinthus membranaceus;
labyrinthus osseus
• vestibule,
• semicircular canals
• cochlea
Membranous labyrinth
• The Utricle
• The Saccule• (macula acustica )
• The Semicircular Ducts• (crista ampullaris )
• The Ductus Cochlearis• (spiral organ of Corti )
conduction of sound