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Doctor insights on: Nerve Impulse Transmission

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Describe how a nerve impulse is transmitted along to axon?

Describe how a nerve impulse is transmitted along to axon?

It's complex: 1. Polarization of the neuron's membrane; 2. Resting potential gives the neuron a rest; 3. Action potential: sodium ions move inside the membrane; 4. Repolarization: potassium ions move outside, and sodium ions stay inside the membrane; 5. Hyperpolarization: more potassium ions are on the outside than there are sodium ions on the inside; 6. Refractory period puts everything back to normal. ...Read more

Nerve (Definition)

The brain and spinal cord communicates with what is occurring in the internal organs and limbs by nerve fibers where are like electrical wires with insulation (myelin) and the "copper" (axon). Within brain and spinal cord these nerves connect to other nerves via synapses on both axons and dendrites. A nerve can carry information regarding sensations, and ...Read more


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Describe what is nerve impulse?

Describe what is nerve impulse?

Electrical transmiss: Information travels down a nerve as an electrical impulse. At the end of the nerve, the connection with nerves, muscles or glands is called a synapse, by chemicals called transmitters. ...Read more

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Can you tell me how a light touch stimulates a nerve impulse?

Can you tell me how a light touch stimulates a nerve impulse?

All Feeling: Has to travel through nerves. You can't feel anything without the nerves, so any sensation felt is due to nerves that send signals to spinal cord and brain. ...Read more

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What factors influence the time necessary for a nerve impulse to be transmitted?

What factors influence the time necessary for a nerve impulse to be transmitted?

Milliseconds: Nerve impulses in arms and legs typically travel at speeds over 40-50 meters/sec, as measured by EMG equipment. Nerve size, local temperature, chemical balance, especially sodium and potassium, can all affect appropriate nerve velocity speeds. ...Read more

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If the immune system attacked killed the neurons cell body axons dendrites nerves throughout the body is it possible and what diagnosis would this be?

If the immune system attacked killed the neurons cell body axons dendrites nerves throughout the body is it possible and what diagnosis would this be?

Complicated: This description is quite improbable and sounds as it the person may be deceased. If you are having neurological deficiencies stronglysuggest that you see a neurologist and be evaluated. Good luck. ...Read more

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With peripheral neuropathy, what conditions could cause damage to both axons and myelin as shown in nerve conduction tests? And can it be reversed?

With peripheral neuropathy, what conditions could cause damage to both axons and myelin as shown in nerve conduction tests? And can it be reversed?

Brief explanation: Most neuropathies affect myelin coverings (Schwann cell), but an advancing axonal neuropathy can secondarily affect the myelin. This is not simple, and you would be far better served by a Concierge consult, and/or find an experienced Medical School neurologist. Reversibility depends on causes and appropriate therapy. ...Read more

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What exactly is brain neurophysiology and how does it change in an addiction?

What exactly is brain neurophysiology and how does it change in an addiction?

Biology of the brain: There are areas of the brain that become more active due to addictions. Neurophysiology can study the activity of these areas via eeg, mmg, fmri or other monitoring methods. ...Read more

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How can novocain (procaine) works on axon membrane?

How can novocain (procaine) works on axon membrane?

Sodium channels: Local anesthetics work on the neuron's sodium channels inhibiting ion exchange and therefore depolarization of the nerve. ...Read more

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What are axons?

What are axons?

Axons: Are nerve fibers that come out of nerve cells (Neurons) & conduct electrical impulses away from the neurons, to transmit information to different tissues. ...Read more

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What is a axon test? How is it done?

Concussion test: It is a concussion test that can accurately diagnose concussion injuries. The test uses well known playing cards and measures reaction time and memory. ...Read more

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What is the axon and what does it do?

What is the axon and what does it do?

Axon: Nerve fiber projecting from nerve cell (Neuron), conducting electrical impulses to send information to other neurons & muscles & glands. ...Read more

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What is the function of an axon terminal?

What is the function of an axon terminal?

Transmission: The axon transmits the electrical signal from the nerve to the next nerve or a muscle through the neuromuscular junction. ...Read more

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Which diseases or disorders affect axons?

Which diseases or disorders affect axons?

Numerous: If the axon affected is located in arms or legs, this is a peripheral neuropathy, if in spinal cord, perhaps a myelopathy, and brain and eyes, neuritis, encephalopathy. ...Read more

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What are the symptoms of axon degeneration?

What are the symptoms of axon degeneration?

VARIES: Several peripheral neuropathies are considered "axonal" problems, and these include alcohol nutritional, diabetes, solvent poisoning, porphyria, amyloidosis, but small fibre axonal problems may be seen in sarcoid, sjogren's, lupus, paraproteinemias, celiac disease. Symptoms include pain, numbness, weakness, inability to discern hot/cold. Perhaps problems with balance. ...Read more

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What is the role of the axon in learning and development?

Arms and legs: The neuron is the cell of the brain that is involved in learning and development. They need to be connected to other neurons to communicate. The axon is the arms or legs of the neuron that connect one neuron from another one. Without them, no communication and no learning and development. ...Read more

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What is axonopathy of small cutaneous sensory axons? And what are treatments/prognosis?

As above: Not every problem can be answered without. Evaluation; see your PCP for evaluation and advise. ...Read more

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Could lidocaine block the na channels at the ap or at the dendrites (before or after the axon hillock). Is it possible an ap fires?

Could lidocaine block the na channels at the ap or at the dendrites (before or after the axon hillock). Is it possible an ap fires?

Nonspecific: Na channell blockade is a characteristic of lidocaine, that what allows it's use not only as a local anesthetic, but as antiarrhythmic agent as well. Although I must admit that I did not completely understand your question, the answer is yes, to my opinion. Hopefully you will be helped more by my colleagues, good luck. ...Read more

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Would presence of rabies virus in the cytosol of an axon cause pain?

Would presence of rabies virus in the cytosol of an axon cause pain?

Contributing factor: In later stage rabies, inflammation of affected tissues (such as neurons) could contribute to pain. For a detailed review of the pathogenesis of rabies, see http://www. Ncbi. Nlm. Nih. Gov/pmc/articles/pmc2600441/. ...Read more

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Can stem cells be used for regeneration of oligodendrocytes to remyelinate axons that have been degenerated due to alcoholism?

Can stem cells be used for regeneration of oligodendrocytes to remyelinate axons that have been degenerated due to alcoholism?

There is no evidence: For this to be the case presently. Unfortunately there is limited data in regards to the use of stems cell for most applications. Beyond stem cell transplants for bone marrow related disorders there are some accepted stem cell therapies for bone, skin and corneal diseases. There really isn't much presently for neurologic disorders. Maybe in the future though. ...Read more

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Can the rabies virus replicate in the cytosol of an axon as opposed to the axons cell body?

Nucleus not needed: Viral replication can occur wit no host protein requirement. However, viral particle assembly does require the host's golgi apparatus. Please see the following for an in depth review of the pathogenesis of rabies: http://www. Ncbi. Nlm. Nih. Gov/pmc/articles/pmc2600441/. ...Read more

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Emg rpt. Chronic inactive assymet myopathic process, left leg. Changes supported of chron inactive axon loss. And Rt l5 radiculopathy. Pls explain. Ty?

Emg rpt. Chronic inactive assymet myopathic process, left leg. Changes supported of chron inactive axon loss. And Rt l5 radiculopathy. Pls explain. Ty?

Lumbar disk: Hits a nerve. (radiculopathy) the wiring to the muscle is sorta kinda lost (axon loss). the muscle weakens because it ain't doing nothin (chronic inactive myopathic... blah blah).
rather an indication for surgery. ...Read more

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For foot drop from a B12 deficiency, is the axon or myelin covering most often impacted?

For foot drop from a B12 deficiency, is the axon or myelin covering most often impacted?

Foot Drop: Most often is is the myelin sheath or insulation that is impacted. If the axons are effected it takes longer to recover if the causative reason is addressed. At about the 3 week mark after the occurrence it is easy to document the actual injury and extent with electrodiagnostic testing (ncs/emg). This would tell if demyelinating, axonal or combination of the two. This can help define prognosis. ...Read more

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Son is now 15 years old. Amblyopia/missing ganglion axons in center one eye. Noticed seizure and was told he had Lisch Nodules. Told nothing to do.

Son is now 15 years old. Amblyopia/missing ganglion axons in center one eye. Noticed seizure and was told he had Lisch Nodules. Told nothing to do.

Followup needed: A Lisch nodule is a pigmented hamartomatous nodular aggregate of dendritic melanocytes affecting the iris. The fact that he has had a seizure is suggestive of associated condition called neurofibromatosis one. He needs to be seen by a neuroophthalmologist as well as evaluated for other lesions which can also affect different areas of the brain and skin. ...Read more

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Can axons be damaged during arthroscopic ankle surgery?

Can axons be damaged during arthroscopic ankle surgery?

Entrapment: Sometimes when the arthroscope is inserted into the ankle it may damage a nerve. If so give it time. If it doesn't go away perhaps a cortisone injection around the nerve may help. ...Read more

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What are electric nerve impulses I can control called?

What are electric nerve impulses I can control called?

Please clarify: You are not likely to get an answer to this question because its meaning isn't clear. There is no such thing as an electric nerve impulse. Neuronal transmission is an electrochemical process, and yes, there IS a difference. As for control, all voluntary thoughts and movements are under our control. That's the definition of voluntary. ...Read more

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Sometimes when I drive my bike for along period of time my right testical is paining an feeling like my riht testica nerves slown?

Sometimes when I drive my bike for along period of time my right testical is paining an feeling like my riht testica nerves slown?

Pressure injury: Prolonged bike riding can lead to damage of the nerves and blood vessels that supply your penis and testicles. When you are riding be sure to stand up on the pedals every few minutes to relieve the pressure and allow normal blood flow for a minute or two. Also try different bike seats to find one that does not put as much pressure on your groin. ...Read more

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Lv3-lv4 and lv4-lv5 intervertebral disc levels causing narrowing of both lateral recesses along with compression of exiting of nerve roots.

See spine specialist: I would get an evaluation from a spine surgeon, either orthopaedic or neurosurgeon. They can evaluate you properly and treat you with either therapy, epidural injections or other surgical procedures. Treatment of a back problem before it gets too bad is a prudent idea. ...Read more

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2 months ago I had two pieces of my rib removed on back. I am now feeling sharp, burning pains along side of my rib. Pinched nerve? What Can I do?

Why did you have it?: What was the reason for the surgery? Could you have impingement on an intercostal nerve? Yes. If so, response depends on the background situation. If you don't have pain proneness and no other background pain syndromes then injection of an impinged intercostal nerve can be helpful. Was the background problem something that could be progressive? Do you need re-eval for that? ...Read more

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Pain along brachioradialis. Feels like bandaid being ripped. Mri shows reverse cevical lordosis. Could it be trapped shoulder nerve?

Pain along brachioradialis. Feels like bandaid being ripped. Mri shows reverse cevical lordosis. Could it be trapped shoulder nerve?

Radiculopathy: Radiating arm pain and a feeling of tightness are common symptoms of radiculpathy... Stemming from compression on the nerve root (s) in your neck. It can be due to a disc bulge- or herniation, slight instability or deformity or bone-spur formation and arthritis... Physical therapy with cervical traction can help, including exercises and anti-inflammaroties. Try that for few weeks to see how it goes. ...Read more

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What does "entrapment of lateral cutaneous nerve of thigh" mean? What conditions go along with that?

What does "entrapment of lateral cutaneous nerve of thigh" mean? What conditions go along with that?

Pressure on nerve: This means that the nerve that carries sensation from the outer part of the thigh gets entrapped or pinched in the thigh or pelvis. Usually this happens as it passes down from the abdomen to the thigh underneath a ligament. This is mostly seen in diabetics, people who experience rapid weight gain, pregnancy, obesity, tight clothes/belts. It is generally gets better once the cause is removed. ...Read more

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I have pretty consistent pain along my sciatic nerve and lower back on my left side. Can't stand straight when I wake up. Thoughts?

I have pretty consistent pain along my sciatic nerve and lower back on my left side. Can't stand straight when I wake up. Thoughts?

Most likely abnormal: Most likely abnormality of lower spine or hip. If have not already had, xrays would be helpful. Use heat twce daily and take ibuprofen before bed. ...Read more

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Felt like something hot was being dragged along my skin briefly, didn't hurt really but it made me wince, bymy entire right rib to my hip. Maybe nerves?

Felt like something hot was being dragged along my skin briefly, didn't hurt really but it made me wince, bymy entire right rib to my hip. Maybe nerves?

Nerve irritation: The sensation you describe is a paresthesia. It is an indicator of nerve root injury. Causes include local nerve injury, kidney stones, and more rarely infections, lack of blood flow, genetic conditions, medication side effects and vitamin deficiencies.
New, severe, or persistent symptoms are worthy of an office visit to check for these conditions. ...Read more

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Could olanzapine be used along side amitriptyline to treat nerve pain?

Could olanzapine be used along side amitriptyline to treat nerve pain?

Recommended: And used in many chronic pain disorders. There is no problem in taking those drugs together and often recommended. They work on separate nerve receptors and do not affect each other. However, always ask your doctor for more information about your individual situation and always present your current drug list. ...Read more

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Do I have to bring someone along, or can I drive after a radiofrequency nerve ablation?

Do I have to bring someone along, or can I drive after a radiofrequency nerve ablation?

Care post nerve rx: I would need more info about this which should be obtained from your md. Type of nerves treated? Type of anesthetic delivered? For example a temporal nerve ablation with no sedation would easily permit driving home but more extensive peripheral nerve treatments may require general and/or IV sedation in which case you should have a designated driver and someone to assist you post op. ...Read more