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10/6
Hearing Sciences
| Question | Answer |
|---|---|
| Where are the hair cells located? | on the basilar membrane |
| What is the cochlea of the inner ear? | the most anterior structure, named for the sea snail that its shape resembles, 2 and 5/8ths turns, large bundle of nerve cells enter the center |
| What is the name for the large bundle of nerve cells that enter the center of the cochlea? | the auditory branch of the eighth nerve |
| If you are in the middle ear, how do you get to the scala vestibuli | the oval window |
| If you are in the middle ear, how do you get to the scala tympani | the round window |
| What is the roof of the scala tympani? | the basilar membrane |
| What is the modiolus? | the center of the cochlea, the bony canal turns around it, continuous left turn, like a spiral staircase, walls are solid bone |
| Who discovered the organ of corti? | Alfonzo Corti |
| What does the organ of corti include? | the outer hair cells, inner hair cells, and the tectorial membrane |
| Where can you find the organ of corti? | in the scala media |
| What is the labyrinth of the cochlea? | ends at the helicotrema in the apex, 33 mm length base to apex (1"), 2 and 5/8th turns |
| Where is the base of the cochlea? | near the stapes footplate |
| Where is the apex of the cochlea? | at the other end of the bony labyrinth (away from stapes footplate) |
| What is a labyrinth? | a complex system of paths or tunnels |
| Where does the labyrinth of the cochlea end? | at the helicotrema in the apex |
| What is the helicotrema? | Where the scala vestibuli and the scala tympani meet |
| What fluid is in both the scala vestibuli and the scala tympani? | perilymph |
| Where can you find the osseous spiral lamina? | when you walk into the oval window and grab the "handrail," you grab it |
| What is the osseous spiral lamina? | the bony extension of the medial wall of the bony labyrinth, runs continuously along the medial wall |
| What are the fibers coming off of the hair cells? | nerve fibers |
| What are the holes on the osseous spiral lamina? | the habenula perforata |
| What comes out of the habenula perforata? | the nerve cells |
| What are the spiral Ganglion? | cell bodies in the modiolus |
| What happens to the width of the osseous spiral lamina? | it decreases between the base and apex of the cochlea. By the time it reaches the third turn, it has nearly disappeared |
| What are the qualities of the scala vestibuli? | it is bounded inferiorly by Reissner's membrane, ends at the helicotrema, and contains perilymph |
| What is the floor of the scala vestibuli? | reissner's membrane |
| Where does the scala vestibuli end? | the helicotrema |
Created by:
hrshook0104
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