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

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