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.
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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]
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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 ...
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51 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 ...
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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 ...
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70 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 ...
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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 ...
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16 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 ...
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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 ...
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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 ...
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1answer
54 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 ...
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3answers
270 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 ...
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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 ...
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59 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 ...
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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 ...
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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 ...
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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 ...
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37 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 ...
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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?
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1answer
25 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 ...
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1answer
53 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 ...
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1answer
36 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:
...
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2answers
74 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 ...
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3answers
98 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 ...
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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 ...
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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 ...
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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 ...
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1answer
64 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 ...
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1answer
421 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 ...
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2answers
64 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 ...
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1answer
67 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 ...
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1answer
72 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 ...
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2answers
267 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 ...
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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 ...
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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 ...
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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 ...
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0answers
54 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 ...
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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 ...
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1answer
162 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 ...
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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 ...
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1answer
36 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 ...
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2answers
100 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 ...
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1answer
350 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, ...
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1answer
907 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 ...
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1answer
276 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
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1answer
50 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 ...
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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 ...
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0answers
98 views
Why Cerebrospinal fluid is not heated for VDRL?
For performing VDRL of serum , we heat serum to inactivate complement proteins which may otherwise interfere , but why don't we do same for CSF even though it too has complement proteins in it?
Is it ...
3
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1answer
79 views
Why there is no neurovascular drug-eluting stent?
I'm researching on neurovascular stents and I'm wondering why there is not much about drug-eluting neurovascular flow diverters in the literature? I read in an article that it's because of complex ...
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2answers
662 views
Neuron connectivity- how are they connected physically
If Neurons are only connected through synapse and there is no physical connection, how are they just suspended in brain layers?
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1answer
81 views
Are there humans which the brain sends signals to the limbs faster than the average?
I have done some researches on the time taken by the brain to send signals, but I didn't find whether that time is the same amongst all humans or there are some differences, and I have based my ...
