Questions tagged [neurology]
The medical specialty involving the diagnosis and treatment of all categories of disease involving the central, peripheral, and autonomic nervous systems, including their coverings, blood vessels, and all effector tissue, such as muscle.
163
questions
-3
votes
1answer
39 views
How are electrodes working? (EEG) [closed]
How do electrodes receive signals from the brain when using/doing an EEG? Is there some "circuit" for it? Is it harmful if you have many (more than 50-100) on your head?
I found out that ...
1
vote
1answer
37 views
Read neural activity only having access to the brain from the “outside”
Is it possible to read neural activity from the outside of the head and if you had an machine learning algorithm that could learn what the signals "mean" (for example moving the right arm)? ...
0
votes
0answers
19 views
Specified effect of trans cranial electric stimulation on neurotransmitters
Can a specific voltage from a trans cranial stimulation activate specific neurotransmitter receptors or channels? By specific, it means receptors dedicated to specific neurotransmitters such as ...
0
votes
0answers
18 views
I just do not understand how myelination speeds up action potentials [duplicate]
first off, I've watched like 7 youtube videos, read a bunch of articles, and the explanations for why myelination actually increases action potential propagation differ each time are very vague. I've ...
0
votes
0answers
17 views
How does the presynaptic terminal stay at the postsynaptic neuron? [duplicate]
I wondered about this because the two neurons never actually touch. The synaptic cleft is very small, but if there is no connection the neurons might easily separate...
[in chemical synapses]
0
votes
0answers
9 views
Direction of impulse at Axo-axonic synapse and dendro-dendritic synapses
Do axo-axonic and dendro-dendritic synapses show some different impulse conduction directions than the usual dendritic (of carrying impulse towards cyton) and axonal nature (of carrying impulse away ...
0
votes
0answers
53 views
How are thoughts biologicaly generated?
I want to know how thoughts are biologicaly generated. I know that electrical impulses can trigger formed memories in the brain but what I want to know is how the electrical impulse is generated in ...
0
votes
0answers
17 views
Why exactly does UMN lesion cause hypertonia?
The corticospinal tracts are excitatory in nature (Glutaminergic). So damage of the CST would mean less excitatory input to the LMN. By this logic, there should not be hypertonia. What is the ...
1
vote
1answer
71 views
The Relationship between Copper and Alzheimer's Disease
I've been reading up about the research concerning the etiological factors behind Alzheimer's and I came across two papers - "Studies on Copper induced stability changes in DNA fragment (GCA ATC ...
2
votes
0answers
26 views
Can Inositol triphosphate (IP3)-mediated Calcium release on its own cause membrane depolarization?
This is about smooth muscles.
I know that the Voltage-operated Ca²+ channels on the smooth muscle membrane can be opened by membrane depolarization to threshold. I also know
that this depolarization ...
0
votes
0answers
17 views
Bundle of His and Atrioventricular Bundle difference
I see most definition using Bundle of His and AV bundle interchangeable including the wikipedia when you do a Google search for AV bundle
But my text book treats as two different things.
The action ...
1
vote
0answers
59 views
Why does the intelligence of an animal correlate with the brain to body mass ratio more closely than to the mass of the brain itself?
It seems counterintuitive that a large animal with a large brain is likely to be less intelligent than a small animal with a medium size brain. It would make more sense if the intelligence of the ...
0
votes
0answers
25 views
How does the brain initiate the process of releasing the neurotransmitters?
Just reading up on the basics of neuroscience. Had a basic question on the signal generation. I understand the concepts of sodium, potassium pumps and how the action potential travels through the axon ...
4
votes
1answer
56 views
Can potassium ions depolarise neuron membranes?
I am reading a journal paper about the cell adhesion molecule NCAM2 and I have come across the following statement:
To confirm the functionality of the reporters, neurons were time-lapse
recorded ...
0
votes
3answers
271 views
If due to some reasons a small portion of our neurons die, how does our body remake them?
There are various reasons such as intake of neurotoxins, and possibly traumatic injuries, that can cause neurons to die.
After several hundreds, or thousands of our neurons die, how does our body ...
0
votes
0answers
17 views
What are kinesiological factors? [duplicate]
I am in search of a term that describes movement, or practice of motor skills, as a factor of laterality. Would "kinesiological" be appropriate? I'll leave my two previous questions down ...
1
vote
0answers
83 views
When and Why does G0 phase occur?
I've asked this question, specifically because i've seen this question.
As we see in this diagram , G0 phase occurs after M phase and at a specific point within G1 phase.
Is there a meaning to ...
0
votes
0answers
25 views
Is there such a thing as transcranial magnetic inhibition? inhibit regions of the brain?
is there such a thing as transcranial magnetic inhibition?
There is an instrument capable of inhibiting regions of the brain as does transcranial magnetic stimulation, but in reverse?
By inhibiting, I ...
1
vote
0answers
30 views
What type of factor is practice of motor skills?
I recently asked a question about the cause of motor laterality: What causes motor laterality/ side dominance?
I understand that there can be genetic factors, epigenetic factors, or environmental ...
2
votes
1answer
19 views
Does the corpus callosum have a significant relationship with motor memories/ muscle memories?
With the corpus callosum located in the cerebrum, and motor memories having a closer relationship to the cerebellum (which I'm not quite sure about), is there a significant relationship between the ...
4
votes
0answers
38 views
What causes motor laterality/ side dominance?
I would like to understand what leads up to motor laterality, or side dominance of motor skills.
I made this assumption that it depends on neuroplasticity and the side in which one first learns the ...
1
vote
0answers
31 views
Myelination of 1st Order Neurons in Spinal Cord Ascending Tracts
When a 1st order sensory neuron enters the Dorsal Column Ascending Pathway (i.e. Spinal Cord), does it get its myelination from Oligodendrocytes (as inside CNS) or it retains Schwann Cell myelination?
0
votes
1answer
27 views
Is grip force a reflex?
When we reach for an object, for example, a cup, is the force used to hold it a reflex? Which sensorial information is used to select the force to hold it?
Why I am interested in this question
With ...
0
votes
1answer
56 views
Are “tremors” and “ tetanic contractions” the same thing?
Do these two expressions have the same meaning?
1- Tetanic contractions in the skeletal muscles
2- Rythmic shaking of the hands
(These two expressions are supposed to be two symptoms of Parkinson’s ...
-2
votes
1answer
37 views
Alternative hypothesis for learning in brain beyond the hebbian rule
I was reading on wikipedia that there are exceptions to the hebbian rule, and I was curious about the possibilities of other hypotheses of how learning occur in the brain. So I would like to know:
...
5
votes
2answers
79 views
How do anticholinesterase pesticides kill nematodes?
Compounds that inhibit the enzyme acetylcholinesterase are commonly used as pesticides. In animals with centralized respiratory systems controlled by the nervous system, poisoning with an ...
-2
votes
3answers
100 views
If the Brain can store as much information as a billion hard disks why cant i memorize a single word document of random letters?
I read a lot of articles on this and all seem to agree that the brain storage in neural connections is tremendous but that doesnt explain why we forget things so easily and have such a modest memory ...
1
vote
0answers
16 views
Is downregulation of neurological receptors fully reversible, i.e. complete upregulation and resensitization?
Are down/upregulation truly reciprocal mechanisms? After a binding ligand or agonist is removed, such as a prescription medication, is upregulation and resensitization able to occur to a level that ...
1
vote
0answers
17 views
static versus dynamic equilibrium when bending over
When a person stoops/bends over, is the equilibrium functioning static equilibrium or dynamic equilibrium? I am not sure, because on the one hand the person is not moving (static), however, his/her ...
2
votes
1answer
44 views
Can a brain be damaged by overstimulation?
I am wondering what, if any, long term health effects there are from high levels of brain activity.
I don't mean cases where a brain is being artificially stimulated, but rather where there is a high ...
3
votes
1answer
67 views
How does an electrical impulse spread in a muscle fiber spread from the motor end plate?
Does this impulse in skeletal muscle spread much in the same way it does in neurons, with an initial potential change that spreads to its immediate surroundings and is then re-amplified or is it the ...
2
votes
1answer
525 views
What causes sodium channels to open?
What triggers the opening of sodium channels in a neuronal membrane? Is it acetylcholine that activates sodium channels in the postsynaptic membrane?
Are sodium channels like receptors that have to ...
3
votes
2answers
69 views
Speed of electric signal vs chemical diffusion
I'm currently reading the book, "An Introduction to Nervous Systems" by Ralph J. Greenspan.
On page 20, there is a sentence that confused me. It was, "Electrical signaling has the advantage of being ...
3
votes
1answer
70 views
What differentiates neurons in different parts of the brain?
For example: what makes a neuron in the hippocampus of the brain different from a neuron in, say, the amygdala, or the frontal lobe, or anywhere else in the brain? Do neurons in different parts of the ...
2
votes
1answer
76 views
Does loss of dopaminergic neurons totally eliminate voluntary muscular control?
Breathing is a function that is not only autonomic, but can also be temporarily overridden and placed under voluntary control. In fact, you are now breathing manually. Now, suppose that someone has ...
2
votes
2answers
272 views
How do organophosphates actually work?
The common explanation as to what the primary mechanism of action for organophosphates (and carbamates) is is the inhibition of the enzyme acetylcholinesterase and resulting buildup of acetylcholine ...
1
vote
0answers
46 views
What substances can selectively destroy certain cells?
Recently, I've watched a documentary about how, in the 1980s, people were buying and using drugs from the streets and then becoming paralyzed a few days afterwards. The drugs that they were using were ...
5
votes
0answers
51 views
What phosphorylates tau protein & and what causes tau to be phosphorylated?
I want to know what phosphorylates tau protein and its 6 isoforms.
I know kinases cause phosphorylation events, and in tau it can be phosphorylated in a healthy neuron in the trans conformation, but ...
1
vote
1answer
39 views
Can motor neurons in the brain stem start movements?
Supposedly (consciouss) movement is started in the cerebral cortex. But some time ago I've read a research which stated it might be possible some movements (not specified which ones, probably mean ...
1
vote
0answers
55 views
Do non-human primates have mental disorders like humans?
I was at the zoo today and watched a gorilla pick at a scab on its finger, compulsively, until it started bleeding. Is this OCD or is it just a nervous thing that non-human primates do at the zoo? Do ...
0
votes
0answers
35 views
Are there toxins that cause heart attack and/or stroke in multiple individuals in short time frames?
Are there any known environmental factors that would cause more than one person to have a heart attack or stroke within a short period of time (e.g. 2-3 months) of one another? I'm particularly ...
2
votes
1answer
164 views
Can cerebrospinal fluid pass through the pia mater or ependymal cells of the ventricles?
During a lecture, a professor commented that the cerebrospinal fluid and interstitial fluid of the brain parenchyma have similar composition because they can exchange with one another. This struck me ...
1
vote
1answer
39 views
Can nervous disorders be cured? Will enough research be the answer? [closed]
I have searched every nook of the internet and I couldn't find a clear and to-the-point answer. Well my story is that I am a young BSc student who wants to do research on neurological conditions ...
0
votes
1answer
37 views
Neurons and nerves [duplicate]
What is a nerve compared to a neuron? Is it a collection of axons alone or does it include cell body too? I'm pretty confused of what actually the "nerve" is composed of. I had imagined that the nerve ...
0
votes
2answers
102 views
Why biologic systems tends to become more complex?
From elements, chemical compounds, cells, multicellular organisms, society evolves and with each step possibilities increase and things get complex. We are builing structures like ribosome builds ...
1
vote
1answer
371 views
Can upper motor neuron lesions cause hypotonia?
I have been taught that hypotonia is always caused by lower motor neuron lesions while hypertonia is by upper motor neuron lesions. However, I recently learned of an entity called central hypotonia, ...
1
vote
1answer
958 views
Rod and cone photoreceptors are neurons?
i mean the photoreceptors have axon and dendrite and body cell or it is not neuron
any more . can we say outer segment of photoreceptor cell is dendrite ? of course these have body cells but i am ...
6
votes
1answer
289 views
Why Is Gray Matter Gray?
When I researched I found different reason for this, the popular
ones are
1) white matter is mylinated .this reason was given in reference books and this website
while others say
2)cell body ...
3
votes
1answer
51 views
Flow diversion for cerebral aneurysms or stabilizing the hemodynamics?
I'm doing research of flow diverter for cerebral aneurysms applications and I'm wondering the reason behind stent placement underneath of cerebral aneurysms is to divert the flow or stabilize the ...
3
votes
0answers
75 views
What is the signal that indicates which neurons Schwann cells should myelinate versus which should remain unmyelinated?
Schwann cells are neuroglial cells that produce myelin in the peripheral nervous system.
However, not all axons are myelinated - some will remain unmyelinated.
There must be some signal that ...
