Questions tagged [nerves]
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37 questions
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Can a muscle issue like a pull or knot, irritate a nerve and cause atrophy in connected muscles?
I understand that things like bone spurs or bulging disks in the spine can impinge on the nerve roots and cause neurological symptoms like pain and loss of sensation or muscle strength, in body areas ...
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Why can't you bend your index finger after your nervus medianus gets injured?
When you get a proximal injury of your nervus medianus, you get the symptom called "The hand of benediction".
So among other things, you can not bend your index finger (because your mm. ...
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Why can we extend the middle finger when there is only one muscle for all fingers?
I'm wondering:
there is the musculus extensor digitorum, that extends finger 2 to 5 up.
There is an extra muscle for the 2. and the 5. finger (m. extensor digiti minimi and m. extensor indicis).
But ...
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Why does a UMN lesion cause hyper-reflexia?
I can see from my reading that "A lesion in an Upper Motor Neuron (UMN) causes Hyper-reflexia (with regards to the Golgi Tendon Reflex)".
I have read various resources but none of them give ...
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Alternative to Limb Lengthening
Some of you who are familiar with the current surgery for limb lengthening know the steps (link):
Break bones
Insert rod
Await callus formation
Lengthen
Consolidate
The issue is during the ...
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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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