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Related Flashcards
Cards In This Set
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What is the components of the external ear and what are their function?
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Pinna - directs sound into the auditory canal
Auditory canal - ends in the tympanic membrane it has ceruminous glands which secrete cerumen which along with hairs prevent the entry of pathogens. |
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What is the tympanic membrane and what does it do?
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It is a thin semitransparent membrane which seperates the outer and middle ear. It convert sound waves into movement.
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What connects the middle ear to the nasopharynx and what is its function?
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Eustacian tube - it equalises pressure either side of the tympanic membrane.
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Name the three bones of the middle ear in order and what is there function?
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Malleus, incus, stapes - they have a large attachement to the tympanic membrane and a small attachment to the oval window which amplifies the sound wave.
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What prevents damage from loud noises?
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Tensor tympani - tightens the tympanic membrane
Stapedius - reduces movement of the stapes |
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Describe the layout of the inner ear?
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It consists of a bony network called the bony labyrinth which encloses a membranous network called the membranous labyrinth.
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What is perilymph?
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CSF like fluid between the bony and membranous labyrinth.
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What is endolymph?
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Unique substance inside the membranous labyrinth.
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Describe the different structures in the inner ear.
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Vestibule - consists of the membranous utricle and saccule, detects gravity and linear acceleration
Semicircular canal - ant, lateral and post contain membranous ducts which detect rotation Cochlea - contains cochlear duct sandwiched by perilymph, it contains receptors for hearing |
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Is the bony labyrinth continous?
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No, it has two opening at the base of the cochleat spiral called the round window - partion between middle ear and cochlear perilymph, oval window - connects to the stapes.
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