Hearing & Balance: Crash Course A&P #17
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Date: 2022-04-04
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Comments and reviews: 9
O'Loughlin
At 3: 25 you state the main job of the Middle Ear Space is to amplify sound. This is not true. The main job of the Middle Ear Cavity is to house the Ossicles. Yes, an increase in sound pressure (or a boost in sound loudness) occurs but it's not due to the Middle Ear Cavity. Sound waves do not just float around in the Middle Ear Cavity. The increase is actually caused by the sound striking the ear drum and moving the ossicles. Because of this we have a change in energy type and thus an increase occurs. When the sound enters the ear it is in wave energy form. When it is transferred from the Tympanic Membrane to the Ossicles it changes to Mechanical Energy. Its this direct transfer of sound energy and change in type that produces the increase in power. One way that we know this is because when a patient has a Stapedectomy (a removal of the Ossicles) or when a patient has a Cholesteatoma (Middle ear growth that erodes the Ossicles) they have a reduction in hearing. not an increase. The way your video explains it, it suggests that even without the Ossicles there should be an increase in hearing and that the Ossicles are there just to transfer the sound. This is not correct. At 5: 51 you begin talking about Cochlear Cilia Length and you state that the closer to the apex we get, the longer the cilia become. This is not correct either. Cochlear cilia maintain essentially the same length as they run the length of the cochlea. However, they are fine tuned to respond to different frequencies based upon location and how they respond to sound. There are three rows of cilia (hair cells) within the cochlea however and these the vary in length. The inner hair cells are shorter while the outer hair cells are longer. At 8: 40 you state that the vestibular information is sent to the brain via the Acoustic Nerve. This is not correct either. It is true that the VIIIth Cranial Nerve appears to be one nerve. However, it actually has two portions. One portion, which starts at the Semi-Circular Canals, is the Vestibular portion and carries all of the vestibular or balance information. The second portion is the Auditory Portion. This part starts where the Auditory Nerve exits the Cochlea and travels through the Modiolus (the central portion of the Cochlea) and then is placed next to the Vestibular portion to form the VIIIth Cranial Nerve. The Auditory Portion carries auditory (sound) signals only. These two sections are completely separate from each other and do not intermix information ever.
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At 3: 25 you state the main job of the Middle Ear Space is to amplify sound. This is not true. The main job of the Middle Ear Cavity is to house the Ossicles. Yes, an increase in sound pressure (or a boost in sound loudness) occurs but it's not due to the Middle Ear Cavity. Sound waves do not just float around in the Middle Ear Cavity. The increase is actually caused by the sound striking the ear drum and moving the ossicles. Because of this we have a change in energy type and thus an increase occurs. When the sound enters the ear it is in wave energy form. When it is transferred from the Tympanic Membrane to the Ossicles it changes to Mechanical Energy. Its this direct transfer of sound energy and change in type that produces the increase in power. One way that we know this is because when a patient has a Stapedectomy (a removal of the Ossicles) or when a patient has a Cholesteatoma (Middle ear growth that erodes the Ossicles) they have a reduction in hearing. not an increase. The way your video explains it, it suggests that even without the Ossicles there should be an increase in hearing and that the Ossicles are there just to transfer the sound. This is not correct. At 5: 51 you begin talking about Cochlear Cilia Length and you state that the closer to the apex we get, the longer the cilia become. This is not correct either. Cochlear cilia maintain essentially the same length as they run the length of the cochlea. However, they are fine tuned to respond to different frequencies based upon location and how they respond to sound. There are three rows of cilia (hair cells) within the cochlea however and these the vary in length. The inner hair cells are shorter while the outer hair cells are longer. At 8: 40 you state that the vestibular information is sent to the brain via the Acoustic Nerve. This is not correct either. It is true that the VIIIth Cranial Nerve appears to be one nerve. However, it actually has two portions. One portion, which starts at the Semi-Circular Canals, is the Vestibular portion and carries all of the vestibular or balance information. The second portion is the Auditory Portion. This part starts where the Auditory Nerve exits the Cochlea and travels through the Modiolus (the central portion of the Cochlea) and then is placed next to the Vestibular portion to form the VIIIth Cranial Nerve. The Auditory Portion carries auditory (sound) signals only. These two sections are completely separate from each other and do not intermix information ever.
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Mollie
I just recently watched Labyrinth for the first time. When I saw the word labyrinth, my thoughts immediately went to David Howie as Jareth. I was so glad that when he mentioned the word, that a little Jareth popped up. RIP David Bowie.
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I just recently watched Labyrinth for the first time. When I saw the word labyrinth, my thoughts immediately went to David Howie as Jareth. I was so glad that when he mentioned the word, that a little Jareth popped up. RIP David Bowie.
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emilyfaith
I love the idea of people who don't watch vlogbrothers just seeing you with a guitar that says -this machine pwns noobs- and having no context for it whatsoever. Also, nice haircut.
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I love the idea of people who don't watch vlogbrothers just seeing you with a guitar that says -this machine pwns noobs- and having no context for it whatsoever. Also, nice haircut.
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-ikolatal-
I really want to understand crashcourse videos. But you speak very fast. Also it is hard to understand scientific words in english. I really need turkish subtitle.
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I really want to understand crashcourse videos. But you speak very fast. Also it is hard to understand scientific words in english. I really need turkish subtitle.
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XIAOYU
I think I may have found a mistake---Tectorial membrane should be the membrane that tickles the orgon of corti instead of basilar membrance according to my prof
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I think I may have found a mistake---Tectorial membrane should be the membrane that tickles the orgon of corti instead of basilar membrance according to my prof
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Shane
Is it just me or does the tympanic cavity and auditory ossicles remind you of an automotive power brake system (master cylinder and booster? lol
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Is it just me or does the tympanic cavity and auditory ossicles remind you of an automotive power brake system (master cylinder and booster? lol
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Omoghene
I don't get it why do tons of people say he's too fast or have to slow down the video he sounds perfectly normal to me and not fast at all
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I don't get it why do tons of people say he's too fast or have to slow down the video he sounds perfectly normal to me and not fast at all
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Saiyem
I was so deep in the lecture I literally felt like throwing out when he talked about sensory conflict.
He talked and I experienced one.
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I was so deep in the lecture I literally felt like throwing out when he talked about sensory conflict.
He talked and I experienced one.
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Originalbro
I love the David Bowie reference. Dance magic dance magic dance. Who put that magic on me. Slap that baby. Make it shriek
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I love the David Bowie reference. Dance magic dance magic dance. Who put that magic on me. Slap that baby. Make it shriek
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