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20 Cards in this Set
- Front
- Back
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Pinna- Outer |
The fleshy,cartilaginous external ear flap located in the side of the head. It functions to collect sound waves and directs them into the external auditory canal. |
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External Auditory Canal- Outer |
The passageway that directs sound waves from the pinna to the tympanic membrane. |
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Tympanic Membrane- Outer |
Commonly called the "eardrum". It separates the outer and middle ears. The eardrum vibrates when struck by sound waves and mechanically transfers the sound to the middle ear. |
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Ceruminous Glands- Outer |
These glands secrete cerumen, or earwax, into the external auditory canal. They are located at the base of hairs that line the canal. In combination with the hair, cerumen helps prevent foreign substances from reaching the delicate tympanic membrane. |
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Malleus- Middle |
An ear ossicle (ear bone) commonly called the "hammer". it is attached to the inside surface of the tympani membrane. It articulates with the incus and transmits vibrations from the tympanic membrane to the incus. |
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Incus- Middle |
an ossicle commonly called the "anvil". It articulate with the malleus and the stapes and transmits vibrations from the malleus to the stapes. |
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Stapes- Middle |
An ossicle commonly called the "stirrup". It articulates with the incus and the oval window and transmits vibrations from the incus to the oval window. |
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Oval Window- Middle |
An opening between the middle and inner ear. The stapes attaches to the membrane over the oval window, and transfers the vibrations to the fluid in the inner ear. The membrane over the oval window 22 times smaller than the tympanic membrane. This size difference magnifies the vibrations and enables the hearing of low amplitude sounds. |
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Round Window- Middle |
An opening directly below the oval window. Covered by a secondary tympanic membrane. Buldges out into the middle ear to dissipate the pressure waves within the cochlea, after they have been detected by the inner ear. |
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Eustachian Tubes- Middle |
A tube connecting the middle ear and the nasopharynx. It equalizes the air pressure in the middle ear with that of atmospheric pressure, enabling the tympanic membrane to vibrate freely. |
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Stapedius- Middle |
A small skeletal muscle which limits movement of ossicles and increases tension of the tympanic membrane to prevent damA small skeletal muscle which limits movement of ossicles and increases tension of the tympanic membrane to prevent damage in response to loud, prolonged noises.age in response to loud, prolonged noises. |
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Tensor Tympani- Middle |
A small skeletal muscle which limits movement of ossicles and increases tension of the tympanic membrane to prevent damage in response to loud, prolonged noises. |
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Bony Labyrinth- Inner |
A series of interconnected passageways in the temporal bone. |
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Membranous Labyrinth- Inner |
A series of interconnected fluid-filled tubes found within the bony labyrinth. |
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Cochlea- Inner |
A part of the bony labyrinth resembling a snail shell. It contains the cochlear duct. |
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Cochlear Duct- Inner |
A part of the membranous labyrinth found within the cochlea. It contains the hearing receptor cells |
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Vestibule- Inner |
A part of the bony labyrinth containing the saccule and utricle. |
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Saccule and Utricle- Inner |
A pair of membranous sacs found within the vestibule that contain the receptor cells for gravity and linear acceleration. |
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Semicircular Canals- Inner |
A part of the bony labyrinth containing the semicircular ducts. |
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Semicircular Ducts- Inner |
A series of three fluid-filled ducts found within the semicircular canals. They are oriented at right angles to each other on three planes. The receptors in the ducts provide information on the position of the head and body in space, acceleration, and deceleration. |
