Loss of Motor Neurons
Hi all, I have a suspected diagnosis of spinal muscular atrophy. I became weak about a year ago and I have a family history of it. Of course I will check with my doctor about this question but I can't see him for a month, so I thought I'd check in here.
I was wondering if anybody knows that sort of ratcheting motion with their weak muscles? When I bend my knees you can see them shake, also when I lower and raise my head it's noticeable.
Could this motion be caused my muscles being deconditioned, or is it indicative of nerve supply loss?
I theorized that this is due to fewer lower motor neurons supplying the muscles, resulting in fewer but larger motor units as nearby nerves reinnervate fibers from lost neurons to a certain capacity, resulting in a decreased ability to vary muscle force in small increments. What do you think?