How is the axon different from dendrites?
458577
The Dendrites receive the information transmitted by action potentials from other neurons.  The Axon conducts an action potential to the synapse to pass on to other neurons.  In other words,  Dendrites receive information and the Axon sends information.  \n\nA neuron has many dendrites but only one axon.\n\nHope this helps!
105755
I suspect it is a biochemical process. I skimmed the attached reference, and here is what I was able to pull out: \n\nThere is a complicated process that takes place in the neurons. Chemical action separates positive sodium and potassium ions from anions across a membrane, creating an electric field. Neurotransmitters open ion gateways in the membrane when the field is built up to a certain level. This allows an electromagnetic wave to travel down the nerve. \n\nIt is MUCH more complicated than that, but that is a simplified cartoon version of the events I think.
467557
The direction of a nerve impulse is as follows: dendrite, cell body, axon. Dendrites are short extensions and axons are the longer ones. Once the impulse gets to the end of the axon, it travels through the synapse and then on to the dendrites of the following neuron. Within the neuron the impulse travels electrically with the resting potential changing to the action potential. In between neurons, through the synapse, the impulse is propagated chemically with the release of a neurotransmitter from the synaptic vesicles in the end of the axon . The neurotransmitter binds to receptors on the dendrite of the next neuron which starts the action potential there.
670939
No, that's not right.  The movement of sodium and potassium across the membrane carries the action potential along the neurite, but not between neurons.  Neurotransmitters-released by one neurons (usually at an axon terminal) crosses the synapse, and binds with specific receptors (usually on the dendrite or axon hillock). Once it binds, it usually opens ligand-gated sodium channels.  \n\nYou asked the name of the chemical, but it's actually a class of chemicals, not one, called neurotransmitters.  Common ones are glutamate, acetylcholine, seretonin, epinephrine and dopamine, but there are literally dozens of them.
809192
Although the nervous system is very complex, there are only two main types of cells in nerve tissue. The actual nerve cell is the neuron. It is the "conducting" cell that transmits impulses and the structural unit of the nervous system. The other type of cell is neuroglia, or glial, cell. The word "neuroglia" means "nerve glue." These cells are nonconductive and provide a support system for the neurons. They are a special type of "connective tissue" for the nervous system.\nNeurons\n\nNeurons, or nerve cells, carry out the functions of the nervous system by conducting nerve impulses. They are highly specialized and amitotic. This means that if a neuron is destroyed, it cannot be replaced because neurons do not go through mitosis.
402542
There are a number of theories, but the short answer is "nobody knows".  Could be establishment of new synapses, could be changes in receptor sensitivity, could even be new neurons stimulated to develop, but at this point, we dont have any real idea.
998538
Difference in terms, with different meanings. Nerve ENDINGS can 'regenerate", nerve cells cannot. We experience feeling only at nerve endings...that is why an amputee can experience itching in a limb that has been removed....the nerve itself needs stimulation, but the brain only recognizes feeling at the nerve ending...hence, find what is left of the nerve and stimulate it and the 'itching' will stop. The stimulation is done NO WHERE near where the "itching" occurs. \nWhen nerve axons or dendrites (nerve cell extensions that carry the signals to and from the nerve cell) are cut, over time, they will often regenerate to provide new nerve endings..this is a slow process and can generate nasty sensations while doing so...itching, burning, etc...and it is often hard to find the spot to stimulate to stop the sensation. Spinal cord injuries are so severe and are so far away from the nerve endings that the regeneration is impossible...to date. Research in Stem Cell propagation has shown very exciting results in mice so far...perhaps there will be a day when we CAN repair spinal cord injuries, at least somewhat. But, if current ridiculous prohibitions to this research are not lifted, the prospects of repairing these injuries will be in the distant future. Here, Religious beliefs are getting in the way of real medical progress. \nYour healing is taking place at a normal rate, may take many years before you feel "normal" again...often, as much as 10 years will pass before you are back to somewhat normal feelings. Good luck
192069
There are literally millions of myelinated motorfibers in mammals, and no single one has been identified as the largest.  In general, the motorneurons of the lumbar ventral spinal cord are larger than others.  As a rule, the largest neuron spawns the largest axon, and all motor axons are myelinated.  Though these are not the fastest fibers, they are the longest, stretching from the mid-back to the feet, at the extreme, and thus require very extensive insulation.
507816
http://en.wikipedia.org/wiki/Neurons
886052
neurons are made of molecules  ( which are made of atoms ) but the activity is not on that level ( you might as well ask about the molecules in an extension cord )
97936
Most likely it means a variety of things.  A neuron is a pathway - in whatever subject you are delving in.  It could be the motor neuron from the spine that runs through the cerevbral cortex and into the appropriate site in the brain; the motor is as all motors- it is a source of power - could be a motor of any type, but in this case one is referring to the nerve that causes the firing impulse along the neural pathway to the brain that causes a muscle to contract.  \nThe other is probably speaking of a specific motor neuron - there are billions in the body.
534511
spatial summation is when all the different EPSPs and IPSPs add up to generate an action potential in the axon hillock. Temporal summation has to do with time. If the signals come very close to each other, they can add up to go to threshold and produce one big action potential. Hope that helps.
596971
Afferent (sensory) nerves originate from the dorsal (back) horn. They are classified as pseudounipolar cells and the cell body of the neuron is a bit farther from the dendrites. The dorsal root ganglion is a collection of the cell bodies for the sensory pseudounipolar cells. All sensory nerves have ganglia.
562704
B: They look like large cicrles along the the axon transpoter. What they do is process information that is carried from the dendrite receptors, nucelei in the myelin sheath along the axon, then " process" this stimlui and detremine the next synapse to caary the information to.
69515
nerve cells(neurons) carry electrical signals through the body through the use of dentrites and axons, dentrites usually recieve signals and axons send signals although dentrites can send signals too, the cells relay messages between the brain and muscles and tell the muscles to move.\n\nWhen sending a message neurons send the eletrical signal through the axon into a synapse, then the signal goes into the dentrites of another neuron
928361
Ok- both sides of the brain are "identical" when it comes to nerves.  If it's on one side, it's on the other side in the same place (mirror image).\n\nDiagrams and images only point to one to save space and keep the page from getting messy with lines.\n\nHope this helped.
922837
light, (in the perspective you are talking about) would be, more specifically- visible light.  This light in particular consists of a specific range of of vibrational frequency.  (dont know the range off hand) now, set that aside for a moment.  OKay. Now, through a process known as evolution (inhereted change in dna over time) moleculres began to form in ways that were able to carry out very specific functions. this continues until you have cells and then cells aquire specific functions.....nervous systems develope and with the a nerve cell that responds and is stimulated (specifically) by the particlar wave frequency of visible light(mentioned earlier) now, the visible light spectrum is like the key ( the receptor being the lock) and it activates the cell which then sens an action potential (depolarization) of the cellular membrane at what is known as the site of excitation.  at this site, ion channels open and + charged sodium ions are transported into the cell axon where there is the reversal of the net negative charge.  (keep in mind this is all on the one cell being stimulated) this reversal of the charged is the action potential.  By reversing the charge it has a gradient-like affect which causes an electrical current which travels the length of the axon to what is known as the "terminal buttons" which then enscribe the elctrical message into a chemical message; known as a neurotransmitter , which is then sent across a fluid filled gap between this cell(transmitting neuron or pre synaptic neuron) and the recieving neuron or post synaptic neuron.  The gap is known as the synaptic cleft.  This neurotransmitter is accepted by a form of endocytosis by the recieving neuron and the process continues till the message reaches the brain. here, it gets very detailed and very complex and requires the reading of books not message bored summaries.