organ of hearing (vestibulocochlear organ)
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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