2-Minute Neuroscience: Primary Somatosensory Cortex
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- Опубликовано: 7 фев 2025
- The primary somatosensory cortex is responsible for processing somatic sensations, or sensations from the body that include touch, proprioception (i.e. the position of the body in space), nociception (i.e. pain), and temperature. The primary somatosensory cortex is generally divided into 4 areas: area 3a, 3b, 1, and 2. In the video, I discuss the relative functions of each of these areas.
For an article (on my website) that explains the primary somatosensory cortex, click this link: neuroscientifi...
TRANSCRIPT:
Welcome to 2 minute neuroscience, where I simplistically explain neuroscience topics in 2 minutes or less. In this installment I will discuss the primary somatosensory cortex.
The primary somatosensory cortex is located in a ridge of cortex called the postcentral gyrus. It is situated just posterior to the central sulcus, a prominent fissure that runs down the side of the cerebral cortex.
The primary somatosensory cortex is responsible for processing somatic sensations, or sensations from the body that include touch, proprioception or the position of the body in space, nociception or pain, and temperature. When receptors detect one of these sensations, the information is sent to the thalamus and then to the primary somatosensory cortex.
The primary somatosensory cortex is typically divided into 4 areas: area 3a, 3b, 1, and 2. Area 3 receives the majority of somatosensory input directly from the thalamus, and the initial processing of information occurs here. Area 3b is primarily concerned with basic processing of touch sensations, while area 3a responds to information from proprioceptors. Area 3b is densely connected to areas 1 and 2, and when area 3b receives touch information, that information is then sent to areas 1 and 2 for more complex processing. Area 2 is also involved with proprioception.
Each of the four areas of the primary somatosensory cortex is arranged such that a particular location in that area receives information from a particular part of the body. This arrangement is referred to as somatotopic, and the full body is represented in this way in each of the four regions of the somatosensory cortex. More sensitive areas of the body take up a disproportionate amount of space in this somatotopic arrangement.
References:
Purves D, Augustine GJ, Fitzpatrick D, Hall WC, Lamantia AS, McNamara JO, White LE. Neuroscience. 4th ed. Sunderland, MA. Sinauer Associates; 2008.
I LOVE YOU. THE SIMPLICITY IN WHICH YOU SHARE YOUR KNOWLEDGE IS SO REFRESHING. THANK TOU!🥰
Wish I found this channel earlier, so clear and concise thank you so much!
OKAY I JUST FOUND ABOUT THIS STUFF ACCIDENTALLY THRU A MEME AND /LET/ /ME/ /TELL/ /YOU/ I AM SO fRiCkEn ExCiTeD ABOUT THIS. I AM A NERD AND LOVE LEARNING ABOUT THE BRAIN AS IT HELPS ME UNDERSTAND MY MANY DISORDERS!!! THIS IS AMAZINGLY HELPFUL AND PALATABLE THANK YOU!!
Thank you! My Prof, included links to your videos to watch when learning CNS online
Awesome! My teacher needs to take a few pointers from you!
This video explains why it is not possible for the brain to create pain within the body; instead pain is recognized by the brain.
These are great! thank you!
Is there a second video following secondary somatosensory cortex ?
I got a dumb ass question: What does it actually mean to feel? I get that certain parts of the brain will receive certain signals and this results in certain feelings. But how? It also processes the feeling to put it into 3d space relative to myself but ultimately irrelevant to where my body really is, as seen in phantom pain. So when we feel pain supposedly in our hand, it's not really our hand. Where is that sensation actually? Just in the part of the brain that got that signal? Does that mean every part that is responsible for any type of experience from sight to thought is somehow experienced simultaneously? Is there some illusion that keeps the whole package seemingly unified and not separate? Or are they all projected onto something?
Sorry if this doesn't make a lot of sense.
Yes! I have the same/similar question! Is it some emergent property entangled with consciousness? Once the signal is received... can we go further into that area and figure out what the hell is feeling the sensation... what feels the pain?
Does this impact music and how we feel it in our skin when we hear it?
does this mean the sensory neurons are located in the somatosensory cortex?
Great vid. Could you do the primary auditory complex next?
Nice.
Hello. I have some questions which are important for my decision making regarding cryopreservation. I will probably not go into details here but it's really serious.
1. How quickly do neurons die in a brain of a dead body? Temperature is a major factor i understand so lets say it's 5 degrees Celsius.
2. How does neuron death occur exactly? Do they lose their synapses and stack up in lumps? As what seemingly happens in this video it seems /watch?v=nUyso3A-eGY
3. A brain is a neural network in which information basically exists in parameters of neuron synapses. Therefore, if synapses are lost due to neuron decay, information (memories and everything else) is lost. Is that correct?
4. If an answer to 3rd question is positive, do you think it is physically possible (not with current technology) to reconstruct decayed synapses to original parameters? I understand, that's a hard question so let me rephrase - when neurons die and synapses decay, is there any features and hints to how they were connected are left or do they "self destruct" without a reasonable trace?
Thank you.
1. In about 5 minutes, maybe 6 if you are lucky
2. Various ways, it depends on the type of lesion... from classical things as liquefactive necrosis or apoptosis to stuff like autophagy, excitotoxicity, pyroptosis, you name it! it really depends on the type of lesion.
3. Partially correct, it's not only the neuronal circuits but also the intensity and the frequency of the electrical pulse that determines, function, storage, processing, etc. in the brain... so in theory if you could map out your entire neuronal circuits and reconstruct it exactly the same then you wouldn't have 2 exact brains because rate and intensity of pulses on a neuronal circuit cannot be recreated in that way, and so the information being transported or stored would be different. (This not even considering the influence of the famous glia which is ridiculously important in neuronal communication and signal modulation)
4. You could try to remake a brain from epigenetic markers but good luck with that, good fucking luck with that. Refer to doi: 10.1038/emm.2016.140 for more information on this topic…
Hope this helps... they are very good questions by the way! Congrats
nice find! sub'd
Avatar to Sauske Uchiha to gojo to Kakorot real quick
What does it mean if that part of brain feels like it's working particularly hard when I listen to certain songs? When I listen to Alison Wonderland songs I felt that part of my brain throbbing so I googled what it is and came up with this, thoughts?
I have no idea...sorry!
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