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20 Cards in this Set
- Front
- Back
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Where is the auricle (pinna) and what does it do? |
External ear - protects entry to the ear and directs soundwaves to the acoustic meatus |
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Where is the external acoustic meatus and what does it do? |
Aka - ear canal. It prevents latge objects from damaging the tympanic membrane. |
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Where is the tympanic membrane and what does it do? |
The eardrum. This structure is composed of fibrous connective tissue and sandwiched between 2 epithelial sheets. It forms a boundary between the external and middle ear and vibrates when sound waves hit it. |
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Where is the tympanic cavity and what does it do? |
The body of the middle ear,the tympanic cavity houses the structures of the middle ear. |
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Where is the pharyngotympanic tube and what does it do? |
Inferior to the tympanic cavity,this tube goes from them idle ear to the nasopharynx. This tube is normally closesd, but let's air through when yawning, chewing to equalize pressure. |
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Where are the auditory ossicles and what do they do? |
3 bones between the tympanic membrane and the oval window. |
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Where is the malleus? |
(the hammer) touches the tympanic membrane |
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Where is the incus? |
(anvil) in the middle |
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Where is the stapes? |
(stirrup) fits into the oval window |
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Where is the oval window? |
The stapes moves through this window and initiates pressure waves in the fluid of the inner ear. |
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Where is the vestibule? |
Contains the membranous structures, the utricle and the saccule |
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Where is the utricle? |
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Where is the saccule? |
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Where are the hair cells? |
Rest on the basement membrane of the organ of Corti and vibrates in response to sound waves. |
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What are stereocilia? |
Numerous microvilli on the apical surface of the hair cell |
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What are kinocilium? |
One long ciliun |
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What is a macula? |
Sensory receptors located along the internal wall of the utricle and saccule. |
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What is the otholithic membrane? |
The membrane that the stereocilia are stuck into. |
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What are otholiths? |
Calcium carbonate crystals. |
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Where is the vestibular branch of the CNVIII? |
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