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Vestibulocochlear Organ
Parts:
the external ear Collect and transmit the sound wave
the middle ear Receives the stimulation of sound
the internal ear vibration and do the balance of the
head and body, hearing
External ear
External ear:
Auricle
External acoustic meatus
Tympanic membrane
External ear
1. Auricle
Helix
Antihelix
Tragus
Antitragus
Triangular fossa
Auricular concha
External acoustic pore
Auricular lobule
External ear
The external acoustic meatus:
Cartilaginous part: la l 1/3
Bony part: medial 2/32/3
The la l part runs
forwards and upwards,
and then backwards;
the medial part runs
forwards and downwards
External ear
3. The tympanic membrane
Flaccid part: upper 1/4
Tense part: lower ¾
Anterior malleolar fold
Posterior malleolar fold
La l process of the
malleus
Handle of malleus
Umbo
Cone of light
Middle Ear
Middle ear:
◼ Tympanic
◼ Auditory tube
◼ Mastoid antrum and mastoid cells
Tympanic
1. Tympanic
Position: An irregular air-filled locates within the temporal bone,
and lies between the tympanic membrane and the la l wall
of the inner ear.
Contents: the auditory ossicles, ligaments, muscles, vessels and nerves.
Tympanic
Boundaries of the tympanic (six walls):
•the tegmental wall (superior wall)
•the jugular wall (inferior wall)
•the carotid wall (anterior wall)
•the mastoid wall (posterior wall)
•the membranous wall (la l wall)
•the labyrinthine
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