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Thread: Nerves and Muscles? Neuro-Muscular Actuation.

  1. #1 Nerves and Muscles? Neuro-Muscular Actuation. 
    Forum Sophomore ChaosD.Ace's Avatar
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    Hi guys.

    So I know the somatic nervous system controls voluntary motion. That the Primary Motor Cortex, Premotor Cortex etc. have points in them associated with body parts and movement patterns rather than individual specific muscles. Signals go from there to other parts of the brain where they enter the ventral horn of the spinal cord and then down to the muscles.

    My question is are there definitive seperate channels in the spine for each specific muscle (in other words, a fibre for the bicep, one for the tricep on for each of muscles in your hands etc.)?


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  3. #2  
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    My question is are there definitive seperate channels in the spine for each specific muscle (in other words, a fibre for the bicep, one for the tricep on for each of muscles in your hands etc.)?
    I don't know what you mean by "fibres". As it happens I have a nerve disease which makes it very plain that certain nerves serve specific muscles.
    And you also need to keep in mind that there are sensory as well as motor nerves. My little fingers (pinkies) are sometimes numb, sometimes weak, sometimes both.

    Check this out for starting to look at your specific examples.
    Cervical spinal nerve 8 - Wikipedia, the free encyclopedia


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    Thanks for the reply, yes I understand there sensory nerves, it is just that I am focusing solely on voluntary muscles motion. You said certain nerves serve specific muscles, is this true for every muscle.

    Does every individual muscle in your body have nerves which serve them and only them? So each muscle is individually wired and complex movement is just the simultaneous activation of several different fibres in intricate sequences?
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    There is an individual nerve for each muscle.The path stays on the muscle's side of the spine for sensory until it reaches the medulla.There it crosses over to the opposite side of the brain and into the sensory section.For motor ,it travels down the spine on the brain side until it reaches the vertibrae where the muscle is located then it crosses over to the muscle side.So the sensory and motor have sort of a loop going.Most sensory nerves in the spine are located closer to the back,and most motor nerves are in the front of the spine.I found this out through a video located at the Harvard Med school website.
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    Chaos: Consider this question: Given that muscle cells can only contract, then relax, and, given also a muscular structure containing hundreds of millions, perhaps billions, of muscle cells (I really don't know how many), how can involuntary neural "commands" be given those individual cells in the appropriate places, timed remarkably exquisitely, to provide a "wall" of muscular tissue to move as one, repeatedly, every few seconds, throughout our lifetimes?

    Sometimes it gets chaotic. The exact process eludes my ability to comprehend. jocular
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    I was going to mention somthing about quality but it was irrelevent.The ability of a creature to move using tiny cell units is facinating.A pulse of electric potential travels to a muscle cell opening the calcium channel and alowing actin and myacin to do their thing.They climb on a molecular scale making the muscle contraction and therfore the movement.Not all of the muscle cells contract on every movement.It depends on the signal from the nerves and the amount of muscles avalible.As for the sympathetic and or the parasympathetic nervous system.The question would be weather the signals go all of the way up to the medulla before a sympathetic responce.I am going to take a guess here and guess that they do.
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    Quote Originally Posted by Phd. Cubs View Post
    There is an individual nerve for each muscle.
    This is good news for me.

    Thanks
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    In my own opinion, this isn't true. Not every muscle has something classified as a nerve.

    To me, a nerve is a pathway between a muscle and the brain, either due to connection with the spine, or further to the brain.

    However some muscles, like in blood vessels are regulated directly from detecting the blood pulse itself, and thus have no connection to the brain. Maybe rudimentary at points though.
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  10. #9  
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    Okay but each individual muscle has it's individual connection right?

    So no one "connection" activates 2 muscles?

    I am only talking about voluntary muscles.
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