Motor System of Brain and Spinal Cord?
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I looked this one up in my neuroscience book. Thought I'd add to the above answer. \n\nIt looks like it is hierarchical because of the motor subsystems. Two of these subsystems are Lower and upper motor neurons. Upper are located in the brainstem or cerebral cortex while lower send axons out of the brainstem and spinal cord. Third and forth subsystems regulation teh upper motor systems. Third, cerebellum, forth basal ganglia. \n\nThe interactions are more detailed and too much to type. Good luck. \n\nBTW: I like these sorts of questions.
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The brain is not part of the circulatory system........it's infact part of the nervous system. \n\nThe nervous system of an animal coordinates the activity of the muscles, monitors the organs, constructs and also stops input from the senses, and initiates actions as well. \n\nThe circulatory system consists of the heart, blood vessels, arteries, veins, capillaries, platelets and the plasma.  It's basically is an organ system that moves substances to and from cells.
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Spinal\n\n\n\nErection is basically a spinal reflex that can be initiated by recruitment of penile afferents, but also by visual, olfactory, and imaginary stimuli. The reflex involves both autonomic and somatic efferents and is modulated by supraspinal influences. Several central transmitters involved in the erectile control have been identified. Dopamine, acetylcholine, nitric oxide (NO), and peptides, such as oxytocin and adrenocorticotropic/alpha-melanocyte-stimulating hormone, seem to have a facilitatory role, whereas serotonin may be either facilitatory or inhibitory, and enkephalins are inhibitory.
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Sympathetic nervous system
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I think you will find what you need here:\n\nhttp://faculty.washington.edu/chudler/introb.html\n\nIt is a good but simple site on neuroscience.\n\nThere was an identical question in Yahoo Answers since yours; I answered that in the same way.  Check it out for other help.
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In human, the spinal cord ends at the L2 vertebrae. The tip of the spinal cord is called the conus, and below that is a cluster of spinal nerve roots called the cauda equina or horse's tail.
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If you mean spinal cord ( Backbone ) yes
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The Nervous system is controlled by electrical impulses that are sent from your brain to you verves.
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This part of the brain controls basic functions like heart rate and breathing\n\n\nWhat is the Medulla Oblongata?\n\n\nMedulla Oblongata Mr. Roboto...Domo, Domo
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flexibility, strengthening, sensorimotor function, motor development and functional activities
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http://www.webmd.com/hw/brain_nervous_system/nord640.asp\n\nWEB MD is a great site.
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the autonomic nervous system is under involuntary control and the somatic nervous system is under voluntary control\n\nthere would be a lot more axons in the somatic nervous system because of muscle movement
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I believe you are asking about Motor Neuron Disease.\nMotor Neuron Disease includes many severe disorders of the nervous system characterized by progressive degeneration of motor neurons. \n\nMotor neurons which originate in the spinal cord or brain stem and synapse with muscle fibers are nerves that  carry nerve impulses away from the central nervous system. It facilitates muscle contraction.\n\nSpasms and exaggerated reflexes indicate damage to the upper motor neurons. A progressive wasting (atrophy) and weakness of muscles that have lost their nerve supply indicate damage to the lower motor neurons.♥
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The spinal cord. It forms as a sheet that rolls up into a tube, and from that, the brain develops.
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Brain is the portion of the vertebrate central nervous system that is enclosed within the cranium, continuous with the spinal cord, and composed of gray matter and white matter. It is the primary center for the regulation and control of bodily activities, receiving and interpreting sensory impulses, and transmitting information to the muscles and body organs. It is also the seat of consciousness, thought, memory, and emotion. \nA functionally similar portion of the invertebrate nervous system. \n\nIntellectual ability; mind: a dull brain; a quick brain. \n\nMind the capacity of thinking, reasoning, and acquiring and applying knowledge. Mind refers broadly to the capacities for thought, perception, memory, and decision: “No passion so effectually robs the mind of all its powers of acting and reasoning as fear” (Edmund Burke). Intellect stresses knowing, thinking, and understanding: “Opinion is ultimately determined by the feelings, and not by the intellect” (Herbert Spencer). Intelligence implies solving problems, learning from experience, and reasoning abstractly: “The world of the future will be an ever more demanding struggle against the limitations of our intelligence” (Norbert Wiener). Brain suggests strength of intellect: We racked our brains to find a solution. Wit stresses quickness of intelligence or facility of comprehension: “There is no such whetstone, to sharpen a good wit and encourage a will to learning, as is praise” (Roger Ascham). Reason, the capacity for logical, rational, and analytic thought, embraces comprehending, evaluating, and drawing conclusions: “Since I have had the full use of my reason, nobody has ever heard me laugh” (Earl of Chesterfield). The human consciousness that originates in the brain and is manifested especially in thought, perception, emotion, will, memory, and imagination. \nThe collective conscious and unconscious processes in a sentient organism that direct and influence mental and physical behavior. \nThe principle of intelligence; the spirit of consciousness regarded as an aspect of reality. \nThe faculty of thinking, reasoning, and applying knowledge
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A) Cell bodies is my choice.\n\nCerebral cortex  is a thin, convoluted surface of the brain consisting mainly of nerve cell bodies.♥
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Depends on the function. For example, voluntary movement requires central nervous system and musculo-skeletal system working together, i.e. impulse arises from the motor cortex in the brain, travels through the central/peripheral nervous system to the muscle(s) needed to allow for specific movement, feedback from sensory receptors go back to brain to finetune movement accordingly. (a very basic explanantion!)