The Auditory Sense

Topics: Auditory system, Ear, Middle ear Pages: 4 (616 words) Published: May 16, 2014


The Auditory Sense or Organ of Hearing
The Ear is divided into 3parts:
External or outer ear
Auricle (pinna)
Made of elastic cartilage.
Covered by skin placed on the opposite side of the head.

External auditory canal
Also called the “ear canal” auditory meatus: either of the passages in the outer ear from the auricle to the tympanic membrane. Tympanic membrane
The tympanic membrane is a vital feature of the human ear, and is more commonly known as the eardrum. The tympanic membrane's function is to assist in human hearing. When sound waves enter the ear, they strike the tympanic membrane. The membrane vibrates with the force of the sound wave strike and transmits the vibrations further into bones of the inner ear. Concha- the bowl-shaped cavity just outside of the opening of the ear canal.

Middle Ear
Auditory Ossicles (smallest bones in body)
Malleus
Attaches to ear drum
Articulates with incus.
Incus
Articulates with stapes.
Stapes (stirrup)
Footplate of stapes fits into oval window.
Tympanic cavity:  the major portion of the middle ear, consisting of a narrow air-filled cavity in the temporal bone that contains the auditory ossicles. The function of the Tympanic Cavity is to amplify and transmit sound vibrations. Eardrum

Its function is to transmit sound from the air to the ossicles inside the middle ear. The malleus bone bridges the gap between the eardrum and the other ossicles. Rupture or perforation of the eardrum can lead to conductive hearing loss. The Inner Ear

Oval Window : connects the middle ear with the inner ear.s
Round Window: a round opening between the middle ear and the cochlea that is closed over by a membrane.   The function of the Round Window is to focus and amplify sound.they are a part of the inner ear. Without them, you would not be able to hear properly.

Semicircular canals: filled w/fluid, attached to cochlea and nerves, send information on balance and head position to the brain. Cochlea:...
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