Questions tagged [nerves]

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Do people with missing/amputated limbs have the same EMG readings as normal people?

I'm doing a research on EMG and it's readings for my engineering project, and as I am not a doctor nor a medical student I have no way of finding such a thing out by myself. All the research that I ...
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Why do ventricular action potentials have no local potentials like neuronal action potentials?

I noticed that the depolarization in the ventricular action potential (bottom image) is just a sharp spike, with no local potential that gradually achieves the threshold potential (like the top image, ...
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Why do we use mEq/L instead of mmol/L to quantify physiological electrolytes?

I was looking at a table in my Guyton and Hall Medical Physiology Textbook, specifically in the membrane potential chapter, and noticed that the concentrations were written in that table using the ...
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Question about nerves and their roots

I am new to anatomy and medical sciences in general. The other day, I was studying the stages of the brachial plexus (the roots, divisions, trunks, cords, branches, terminations and so forth). Then I ...
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Can dermatomal problems possibly indicate other medical conditions?

I have been reading up about dermatomes and it got me wondering if dermatomal issues can indicate potential problems further into the body than the dermis? For a couple of examples, can say one of T1 ...
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What are non-specific somatic sensory receptors in the nasal mucosa?

I am reading Oral Medicine: Diagnosis and Treatment by Greenberg and Glick, Chapter 2 - Evaluation Of The Dental Patient: Diagnosis and Medical Risk Assessment. Under Cranial Nerve Examination, ...
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Is leg "falling asleep" (e.g. during meditation) dangerous?

During meditation sits of 30 to 60 minutes, it is common for one or other leg to "fall asleep" after maybe 15 to 20 minutes. Is a leg being "asleep" for between 10 and 45 minutes dangerous? Is it ...
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Supracondylar Fracture to the Humerus

Why does a supracondylar fracture lead to a median nerve injury and not the ulnar? According to one of Gray's Anatomy Review's practice questions, it was the median. Doesn't the median nerve pass in ...
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How to differentially diagnose continuing sciatic pain given this existing information?

Pains along the sciatic nerve apparently have numerous possible causes (18 of them according to this article). Now, given the following facts, what would be appropriate differential-diagnostic ...
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Which nerve inflammation can affect vision other than the optical nerve itself?

Which nerve inflammation can affect vision other than the optical nerve itself? Can a nerve inflammation affect vision?
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1 answer
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What could be a reason for absence of near reflex in eyes

When an object is brought close to a person's eyes, the pupils will naturally move inwards in response to a stimuli, mimicking that of esotropia. However, what could be a reason in which the ...
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What are normal values for EMG/nerve conduction studies?

Where can I find a detailed table of normal values for NCS (nerve conduction studies) for the various arm nerves - ulnar, median, radial; including both motor and sensory component of each nerve; ...
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Could a nerve agent be used recreationally?

Many drugs that will kill you in high quantities are used recreationally in low doses. (e.g. alcohol or heroine). I wonder if you diluted a military grade nerve agent in a lot of water. Would the ...
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Good pain from a healing wound

Why does it feel so good (not dull pain), to encircle or press on a healing wound with a finger at a proximity that is very close to the border of the wound? For example, a healing bruise feels so ...
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Upper Thoracic Pain with Coughing Sensation and Slight Nausea [closed]

What are some possible conditions that can cause the following symptoms? Dull muscular pain between shoulder blades in the center of the back, in the T3-T7 region. Pain is often triggered or made ...
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What is "nervous eczema"?

Is nervous eczema a cause from: stress? Bronchial Asthma: A Genetic, Population and Psychiatric Study - Denis Leigh, Edward Marley - Google Books the nerves? Nervous Eczema Pictures – 64 Photos & ...
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Which part of the body has the most nerve receptors?

I am studying a non-medical field so please bear with me. Which part of the flat skin has the most nerve receptors? I plan to build a grid of vibrators.
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Is a muscle still a muscle after years without usage?

With no usage I mean no active usage because of not working nerves. So basically the question is wether there is like an end-state to muscle atropy where the muscle tissue changes and after what time ...
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Does physical stress on vagaus nerve cause depression?

I usually suffer from palpitations due to stimulation of vagus nerve from gastric problems and sitting/lying posture. Recently I've been experiencing some abnormal mental stress patterns such as slow ...
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2 answers
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Why do I feel small stings all over my body in stress?

I've realized I'm expierencing stress (or rather embarassment) quite differently than I used to. Like a year ago (I was 16) I expierenced stress just as a short warming up of my shoulders. For the ...
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Can constant exposure to static electricity affect the nervous system in any way? [closed]

As titled, can holding a constant static charge affect the CNS? If so, is it detrimental? What are the short/long term effects, if any?
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1 answer
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How to know if a person has seizures? [closed]

Could you please let us know if the following are symptoms of seizures in a 16-year-old: He goes sudden unconsciousness while speaking normally There were no convulsions. When it happens he start ...
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Affects of nicotine on the nerves

There are new methods for getting nicotine. For example, vaping. Some people are almost promoting nicotine as a health product that can reduce the risk of Parkison's disease and colitis. Some people ...
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Sensitization and Energy Crisis in Myofascial Pain Syndrome

In Travell and Simons' Myofascial Pain and Dysfunction: The Trigger Point Manual, an energy crisis within a muscle is said to entail the release of sensitizing substances that could interact with ...
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Can optic neuritis be recovered 100%?

I had inflammation in the optic nerve. There was deficiency in my field of vision. That's because of multiple sclerosis (ms). Now, I'm cured. My field of vision is good. I can see everything but the ...
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Does an infected dental nerve affect nose breahting?

I went to my dentist for a lookup and he told me I needed a tooth canal treatment. He asked me if I had some problems with my nose, like if it's closed or dry. He was right about it and he told me the ...
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3 votes
1 answer
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Why is a tonsillectomy (tonsil-removal) typically more painful the older you are? Are the the pain nerves more advanced?

I had my tonsils removed in my mid twenties, and my doctors told me that it was going to be a lot more painful than if I had done it when I was just a lad. They were certainly correct!! Why is it ...
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Why should one avoid icing the ulnar nerve directly when icing the elbow?

I read on http://www.nirschl.com/elbowten.asp: Ice is an important element in the healing process and should be used any time signs of inflammation or intense pain are present, no matter how soon ...
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3 votes
1 answer
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What is neurofibromatosis?

What is neurofibromatosis and what are its symptoms? I researched it and it still isn't clear to me. Also, at what age does one show the first signs of it?
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2 votes
1 answer
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Recurrent schwannoma implications?

In the early 1990's, I had a mass develop along the ulnar nerve where it passes close to the skin at the elbow (the "funny bone" location). It was painful upon impact and palpation, and when it was ...
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Attempting to move with nerve block? Harmful? [closed]

Today I had surgery on my shoulder to repair my torn labrum. After the surgery, I had the option of receiving a nerve block, which I took. I have been periodically attempting to move my fingers ...
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9 votes
2 answers
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What causes body parts to fall asleep?

Throughout my life, I've had body parts fall asleep (mostly my feet). I get a weird sensation called Paresthesia, or "pins and needles". Though it goes away after a some time, I hate the several ...
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