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Although speech production is in generally executed in the cerebral domain, the dysarthria resulting from damage of the vermous is a symptom of the resulting general muscle weakness. So yes, you get slurred speech because your muscles are weak, but the weak muscles certainly aren't ever isolated to speech production.


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Withdrawal reflex You asked specifically about the withdrawal reflex and the receptors that trigger this. The initiation of the reflex arc is determined at the level of the nociceptors (pain-transducing receptors) in the epidermis. For the most part, these are part of “free” (not encapsulated) nerve endings of sensory fibers. These fibers course within ...


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The answer ends up being on the next page when discussing the ventral corticospinal tract. Many ventral corticospinal tract axons have branches that decussate in the spinal cord, similar to the re-crossed lateral coticospinal tract axons described earlier. In other words, some axons of the lateral corticospinal tract ignore the pyramidal ...


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Asymmetry to essential to neuronal function, particularly in the peripheral nervous system. This is because the dendrites of a neuron receive synaptic potentials, which are graded and decay with distance. Dendrites are typically short such that a synaptic potential is still above threshold by the time it reaches the axon hillock (sometimes called trigger ...


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As you say, a neuron can have thousands of inputs via its thousands of dendrites. Each of those dendrites can have a synaptic connection to the (axonic) output of a different neuron. So the neuron can take inputs from thousands of different neurons, not just from one other neuron. At the other end of the neuron, the output of the axon can form synaptic ...


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First of all, let me clear up a small confusion: a connective tissue is a histological term and isn't relevant to this question :) Check https://en.wikipedia.org/wiki/Connective_tissue on that That already suggests that the depiction you describe isn't accurate. I would hope that you have seen something like this, which shows a neuron's structure in a very ...


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Are neural connections one-way? Yes. Action potentials travel only from dendrites towards axon. typically shown in pictures as an electric pulse traveling along a long, thin connective tissue. What connective tissue? That thin "wire" which carries the action potential is a part of the neural cell body called axon. Depending on what the axon ...


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The sensory and motor pathways can indeed be considered separately both in concept and physically. Of course the nervous systems is a single network of neurons, but that doesn't stop it from having separate components. One can indeed often simplify neural pathways as "IN (sensory) ===> (black box with decision-making magic) ===> OUT (motor)" Reflexes ...


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I don't think it is a clever thing to group all types of decussation and look for a general explanations. I would tend to think that different decussation have different explanations. It is like asking what are the hypothesis to explain evolution of body size. There is no general answer to that but only a list of case specific impact of different factors on ...


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The nerves for sensation do travel intimately close to motor nerves outsides the spinal cord. In these locations only disease processes can preferentially target a particular class of nerves. Diabetic neuropathy is a common condition causing this kind of peripheral nerve injury resulting in sensory loss. In the spinal cord, afferent (incoming) and efferent ...


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Even if it were possible to selectively destroy sensory (afferent) nerves alone, the individual would not be able to walk/move normally immediately afterwards, because there would be no environmental stimuli with which to orient one's actions. Two of the senses people often overlook are balance (or spatial orientation) and proprioception (where the body ...



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