Term
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Definition
| Outermost bone of the 3 auditory ossicles; looks like a hammer. |
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Term
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Definition
| The 2nd bone of the auditory ossicles; Triangular body which meets the malleus, and long limb which meets the stapes. |
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Term
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Definition
| The 3rd auditory ossicle; held by a ligament in the oval window. |
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Term
| Where does the eustachian tube lead to? |
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Definition
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Term
| What are the 2 muscles in the middle ear and their functions? |
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Definition
| Stapedius and tensor tympani; Functions to protect the auditory ossicles from violent vibrations. |
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Term
| What is the bony labyrinth? |
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Definition
| Houses the membranous labyrinth. |
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Term
| What comprises the bony labyrinth? |
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Definition
| The vestibule, cochlea, and the 3 semicircular canals. (Contain perilymph) |
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Term
| What is the cochlea's function in the special senses; hearing or equilibrium? |
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Definition
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Term
| What is the vestibule's and semicircular canal's function in the special senses; hearing or equilibrium? |
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Definition
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Term
| What fluid is found in the bony labyrinth? |
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Definition
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Term
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Definition
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Term
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Definition
| Ovoid chamber which houses the utricle and saccule. |
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Term
| What is the scala vestibuli? |
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Definition
| A space in cochlea above the vestibular membrane, filled with perilymph; apart of the bony labyrinth. |
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Term
| What is the scala tympani? |
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Definition
| A space in the cochlea below the basilar membrane filled with perilymph; apart of the bony labyrinth. |
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Term
| What comprises the membranous labyrinth? |
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Definition
| The saccule, utricle, cochlear duct, and semicircular ducts. (all contain endolymph) |
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Term
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Definition
| Found in membranous labyrinth and is high in potassium ions and low in sodium ions. |
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Term
| What is the vestibular membrane? |
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Definition
| Membrane in the cochlea which separates the scala vestibuli with the cochlear duct. |
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Term
| What is the basilar membrane? |
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Definition
| A membrane in the cochlear which separates the cochlear duct from the scala tympani. |
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Term
| What is the spiral organ? |
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Definition
| (organ of Corti) rests on the basilar membrane in the cochlear duct of the cochlea; contains hair cells which rest on the tectorial membrane. |
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Term
| What is the function of the spiral organ? |
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Definition
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Term
| What is the tectorial membrane? |
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Definition
| Gelatinous membrane sitting on top of the hair cells in the spiral organ which helps to stimulate the hair cells when the cochlea responds to sound waves. |
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Term
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Definition
| Snail shaped structure which houses the cochlear duct, (the cochlear duct houses the spiral organ). |
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Term
| What is the function of the utricle and saccule? |
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Definition
| Associated with static (constant) equilibrium; tells the brain where you are in time and space |
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Term
| What structures are associated with dynamic equilibrium? |
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Definition
| The 3 semicircular canals; tell the brain where you are in relation to objects around you. |
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Term
| What are the functions of the branches of the vestibulocochlear nerve? |
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Definition
Vestibular branch -> equilibrium
Cochlear branch -> hearing |
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Term
| What labyrinth does the semicircular canals and ducts belong to? |
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Definition
Canals- bony labyrinth
Ducts- membranous labyrinth |
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Term
| What is the endolymph sac? |
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Definition
| Resevoir for endolymph located in the membranous labyrinth. |
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Term
| What is the round window? |
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Definition
| A hole with a membrane bulging from the inner ear into the air-filled middle ear; which acts as a pressure valve. |
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Term
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Definition
| One of the 2 "holes" of the inner ear, which opens into the vestibule and is covered by the foot of the stapes. |
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