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-2
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0answers
26 views

Hypothetical - living as a disembodied head [closed]

I'm writing a sci-fi story where a head and part of the neck is somehow surviving perfectly normally on its own (breathing, thinking, talking etc - that's the hypothetical part) but I want to include ...
2
votes
1answer
44 views

In theory how fast could nerve signals travel if the nerve fibre was perfectly insulated?

My question is purely theoretical and my main aim is to find out the maximum speed that a nerve signal can travel within a nervous system and and whether this speed represents the physical limit of ...
0
votes
2answers
92 views

Why we shiver/tremble/shake while performing some work which requires high accuracy?

Shivering when nervous or anxious is a common thing. But, shivering or trembling sometimes also occurs when we are performing a work which requires high accuracy. In such case, our whole body doesn't ...
1
vote
1answer
35 views

Examples of seeking behavior by brainless animals

Are there any examples of brainless animals (e.g. jellyfish) exhibiting seeking behavior, such as following smell or light gradients towards food, or following hormones towards mates?
0
votes
0answers
13 views

examples of animals losing their brains when losing their mobility

I'm looking for examples of animals with central nervous systems that start out mobile, but then become permanently attached to something, and lose their brains. One famous example is that of some ...
3
votes
0answers
21 views

How are targets formed for axon growth cones (CNS)?

Axons have growth cones which find a route to their target using multiple methods (guidepost cells, attraction to target, etc...). My question is, what is the process that actually forms the target? ...
2
votes
0answers
21 views

CNS lymphatic vessels around ventricles lat et 4th?

I am searching for precise locations of the lymphatic vessels of the CNS based on the applications of the article here. However, I did not find any when having a focus on the immediate region around ...
4
votes
1answer
47 views

Why does our mouth “water”?

Whenever we see something delicious, rapid salivation starts in our mouth. Also, it doesn't happen for all other food, which we eat regularly. So, Is there any particular use of "rapid salivation"? ...
0
votes
1answer
117 views

How are neural networks encoded in the DNA? [closed]

The central nervous systems as well as the brain->muscles and sensory cells->brain nervous pathways, need to be precisely wired for life to be possible. Moreover they are wired almost exactly the same ...
1
vote
2answers
84 views

Can the spinal cord contain an “epileptic focus”?

I was wondering, is there a possibility of an something similar to an epileptic focus to exist within the spinal cord? Note I am using the terminology "epileptic" loosely here, principally for the ...
5
votes
1answer
195 views

How are reflexes suppressed?

What neurophysiological process keeps reflex arcs in check? For example, the withdrawal reflex causes the hand to jerk back when the fingers touch something painfully hot incidentally. However, that ...
4
votes
2answers
89 views

Why are our muscles limited to 7 Hertz?

I have heard from a (usually very knowledgeable) friend before, that a human can only tap his fingers 7 times per second. I generalized this to "our muscles are limited to 7 hertz" When my wife ...
4
votes
1answer
119 views

Is the autonomic nervous system only activated by internal stimuli?

My professor claims that the autonomic nervous system is only activated by stimuli from organs but I really feel like I've read that it can be activated by outside stimuli, although I'm not sure what ...
1
vote
0answers
16 views

Imidazoline receptor agonist in clonidine?

I am thinking which pathway is more important in hypertension, ADHD and withdrawal of clonidine: alpha-2 agonist imidazoline receptor agonist (maybe) Alpha-2 is the classical one. Pubchem starts ...
0
votes
1answer
34 views

Who is organizing the heartbeat and its roles in the body?

Throughout the decades we heard that the heart is the only muscle whose nervous system is not acting. So who is he responsible for organising the heartbeat and its roles?
3
votes
2answers
287 views

Before I move my arm the brain sends signals - what causes the brain to send signals? [closed]

Please tell me what causes the brain to send signals, how does the brain send signals? can you tell me what happens between the point when you make an intention to pick up a glass of water, and ...
4
votes
1answer
206 views

How pain can stimulate the vagus nerve

I'm trying to find out why a prompt, severe, short pain is causing a stimulation of the vagus nerve. What could the physiological explanation be? Is that because the pain is triggering the ...
6
votes
2answers
719 views

How long can the brain survive during ongoing cardiac arrest?

There was this interesting discussion on CPR and defib in response to the question "Why can't we defibrillate the heart within 1 minute after ventricular fibrillation by electroshock?". Now I was ...
3
votes
1answer
121 views

Specific location where nerves converge

I'm looking for the "earliest" specific site where the 3 following nerves' sensory signals "converge": Trigeminal nerve Median nerve Superficial peroneal nerve By "earliest", I really mean the ...
2
votes
0answers
1k views

Physiologically, how can stress/anxiety cause neuropathy?

According to the Mayo Clinic, stress/anxiety can cause "pins and needles" (neuropathy) sensations all over the body. But how can this be? My understanding of the sensory pathway is that sensory ...
1
vote
1answer
273 views

Can signals travel “backwards” in the sensory pathway?

My understanding of the "sensory pathway" is that its a linear, directional pipeline as follows: Nerves (fire various signals depending on the type of sensors they are) Fibers (transmit signals from ...
2
votes
1answer
88 views

Anatomy of nervous system's sensory pathways

When I touch my hand on a hot stove, I feel pain. I'm interested in knowing all the main "endpoints" (components/parts of the body) that are involved in relaying this pain signal. As I understand it ...
1
vote
1answer
69 views

How and where do nerves share pathways to the brain?

I am interested in understanding how pain receptors send signals to the somatosensory cortex (the part of the brain that registers various nerve signals such as pain, presure, temperatures, etc). ...
1
vote
1answer
120 views

What specific sensory nerves act as receptors for “pins and needles” (neuropathy)?

According to this excellent answer, the difference between "pain" and "pins and needles" (neuropathy) is that different receptors (sensory nerves) trigger in reaction to different stimuli. Different ...
4
votes
0answers
154 views

Long-term effects of antihistamines on mind and CNS [closed]

Can maybe someone share knowledge or guesses on the following questions: Does the prolonged use of antihistamines cause long-term effects on mind or CNS? Are there any known evidences of their ...
0
votes
0answers
58 views

Are ipratropium and tolterodine parasympatholytic?

They are nonselective cholinoblockers and antimuscarinic. Other cholinoblockers of parasympaticus, which I know, are parasympatholytic such as atropine, butylscopolamine, trihexyphenidyl, titropium ...
4
votes
3answers
704 views

Do skull bones have pain nerves (nociceptors)?

I recently attended an awake brain surgery for deep brain stimulation and it seemed to me that only the skin surrounding the drilled hole got local anaesthesia. I know that the brain itself does not ...
3
votes
2answers
195 views

How is information sent from limbs to the brain exactly?

Say you have a needle, and you poke a very specific area on your left thumb. A signal gets sent from that nerve up your spine and into your brain. How does the brain know exactly where this signal ...
3
votes
1answer
109 views

Biological advantage of electric synapses

Electric synapses are synapses that do not process information but simply foward one action potential from one neuron to the next. There are no neurotransmitters, no inhibitory and exitatory ...