ASCENDING AUDITORY PATHWAY
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- čas přidán 22. 10. 2018
- How do neural signals travel from hair cells in the Organ of Corti to the primary auditory cortex? Well, let’s examine the ascending auditory pathway. Why ascending you ask? Well, ascending means info goes TO the brain, while descending means info goes from the brain elsewhere.
Inner hair cells in the Organ of Corti are connected to type I spiral ganglion neurons (whose axons represent 95% of the cochlear nerve). So firstly, signals travel along the cochlear nerve to the cochlear nuclei in the brainstem on the ipsilateral side. Ipsilateral means same side, contralateral means opposite side. Kay, so here is where is starts to get a little complicated. Most auditory information crosses over, however, each cerebral hemisphere processes stimuli from both the ipsi and contralateral sides. This is advantageous for two reasons.
A) If you get brain damage in one hemisphere, your sense of hearing goes “meh, whatever!”. B) we as humans process some pretty complicated sounds - like those involved in speech, and getting input from both ears to both hemispheres allows for more processing potential.
Anyway, back to the ascending auditory pathway. Our information is at its first stop - the cochlear nucleus. From here, most of the neurons cross over to the contralateral side. This is the primary pathway that the information takes. However, there is also a secondary pathway, in which some neurons stay on the ipsilateral side. In both cases, the neurons synapse in the superior olivary complex, which is also in the brainstem.p The signal continues to be relayed along the lateral lemniscus to the inferior colliculus in the midbrain.
From the inferior colliculus, the information is relayed to the medial geniculate nucleus of the thalamus. Most of the neurons taking this trip stay on the ipsilateral side. However, some cross over. Finally, the information continues into the auditory cortex.
The auditory cortex is tucked into the lateral sulcus. The auditory core region contains the primary auditory cortex, or A1, which is organized tonotopically - in other words, it’s arranged by frequency. There are ACTUALLY tuned neurons that respond only to specific frequencies, and they are arranged in a tonotopic map - how cool is that?
Brain model by:
www.turbosquid.com/3d-models/...
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I spent one hour trying to understand the pathway, You explained it so easily. THANK YOU
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followed a lecture for 2 hours, at home looking at my prof's powerpoint for another 35 minutes like :s.... Searched up the road of the auditory pathway. Clicked on here 2m 30sec, I don't even have any questions. It's clear, fast, simple thank you. Amazing, you got a sub.
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"Brain damage in one hemeshere has little effect on sence of hearing" This line felt me more.... Beacause I can't able to listen left side.... And dr says report is normal😭😭😭😭😭
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please make videos on 'first aid' for USMLE Step 1
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Plz make any videos on anatomy of primary and secondary auditory cortex
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Does it also synapse at inferior colliculus like it did at superior olivary complex? How many times can a afferent neuron synapse inside the CNS? How many interneurons are there involved (possible). Thank you
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Hello
Can you make a video on descending auditory pathway
shouldve told about the trapezoid body and how it demarcates the boundary line between pons
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is that means finally there are relatively less information have been transported to the right hemisphere?(Because the dotted line represents fewer cases)
My hearing loss
at 0:41 he said "most auditory information crosses over to the contralateral side"...However, at 1:45 he said "most neurons stay on the ipsilateral side"...So which one is it? does most auditory info get processed by the contralateral or ipsilateral?
When he said ipsilateral at 1:45 he meant that neurons will not change their direction up from this point. (Those that have already crossed to the opposite side will continue ascending that way)
@@RehamSalama98 Makes sense. Thanks!
Plice help me
It’s been 30 minutes i want to understand , till I found this and understand it by 2 minutes thanks 🥹❤️
Thank you! Almost an hour lecture in 2 just two minutes. I hope I will pass my exam next week tho :D