motor neurons

Motor Neurons By Kurtis Szela

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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. - PowerPoint PPT Presentation

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Motor Neurons By Kurtis Szela

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

Neuron Signals

StructureNeurons 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)

Motor NeuronMotor 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

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

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

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

Spinal Neuron with ALS

http://www.sflorg.com/sciencenews/images/imscn080107_02_01.jpg

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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