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Motor Neurons

Motor Neurons. By Kurtis Szela. Motor Neurons & their Function. C arry impulses from the Central Nervous System to perform muscle movement Motor Neurons are known as the control muscle They directly or indirectly control the contraction or relaxation of muscles.

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Motor Neurons

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  1. Motor Neurons By KurtisSzela

  2. Motor Neurons & their Function • Carry impulses from the Central Nervous System to perform muscle movement • Motor Neurons are known as the control muscle • They directly or indirectly control the contraction or relaxation of muscles

  3. Neuron Signals

  4. Structure Neurons are made up of 3 basic parts : Cell Body- contains the nucleus , mitochondria and ribosomes Dendrites- these branch like cells are located at one or both ends of the neuron. Dendrites make connections to other cells Axons- carry out electrochemical messages (nerve impulses or action potentials)

  5. Motor Neuron Motor Neurons that control muscle contraction have a cell body at one end, a long axon in the middle and dendrites at the other end. The impulse is received at the dendrites and is carried through the cell till it reaches the muscle The signal reaching the muscle fiber is a specialized synapse called the neuromuscular junction The neuron will release neurotransmitters that triggers muscle response

  6. Location: Where Motor Neurons are Found • Most Motor Neurons are located in the brain and the spinal cord • Upper Motor Neurons being found in the brain and Lower Motor Neurons are found in the spine

  7. Motor Neuron Disease • Motor Neuron diseases are a group of disorders that destroys cells that control muscle activity • Basic functions such as speaking, walking and even breathing are effected • Basic transmissions from the Central Nervous System are disrupted • Muscles become weak and uncontrolled

  8. ALS • Amyotrophic lateral sclerosis (ALS) is a common motor neuron disease that affects the nerve fiber • ALS is caused by the death of motor neurons in the spinal cord and brain • As these motor neurons begin to die off the muscles cannot move as effectively

  9. Spinal Neuron with ALS

  10. References • http://science.howstuffworks.com/environmental/life/human-biology/nerve1.htm • http://thebrain.mcgill.ca/flash/d/d_06/d_06_cl/d_06_cl_mou/d_06_cl_mou.html • http://www.bcb.uwc.ac.za/sci_ed/grade10/mammal/nervous.htm • http://www.wisegeek.com/what-is-a-motor-neuron.htm • http://www.sflorg.com/sciencenews/scn080107_02.html • http://www.google.ca/imgres?q=motor+neurons&um=1&hl=en&biw=1024&bih=565&tbm=isch&tbnid=XZSMknnW9rRfZM:&imgrefurl=http://www.sflorg.com/sciencenews/scn080107_02.html&docid=0jWZTP6YZG_QjM&imgurl=http://www.sflorg.com/sciencenews/images/imscn080107_02_01.jpg&w=455&h=387&ei=MzycTuyKN-rs0gHZ-4nNBA&zoom=1&iact=hc&vpx=706&vpy=186&dur=2016&hovh=207&hovw=243&tx=95&ty=115&sig=113077780971686730029&page=1&tbnh=152&tbnw=179&start=0&ndsp=9&ved=1t:429,r:3,s:0 • http://www.google.ca/imgres?q=motor+neurons&um=1&hl=en&biw=1024&bih=565&tbm=isch&tbnid=6MgBYLUjAZdcHM:&imgrefurl=http://www.bcb.uwc.ac.za/sci_ed/grade10/mammal/nervous.htm&docid=_XtGWy-P-tNvfM&imgurl=http://www.bcb.uwc.ac.za/sci_ed/grade10/mammal/images/neuron.gif&w=422&h=621&ei=MzycTuyKN-rs0gHZ-4nNBA&zoom=1&iact=hc&vpx=775&vpy=189&dur=125&hovh=272&hovw=185&tx=103&ty=269&sig=113077780971686730029&page=1&tbnh=159&tbnw=108&start=0&ndsp=9&ved=1t:429,r:8,s:0

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