Knowledge Assgn. 12 H

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Carrie Echols

Loss of power of voluntary movement in a muscle through

injury or disease of it or its nerve supply.

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The Nervous system consists of brain consisting of grey and white matter,

nervous system of motor and sensory pathways and cranial nerves. There are 12

cranial nerves emerging from the brain. Any disease caused by virus and bacteria or circulatory deficiency can damage the brain,

its coverings, meninges and the nerves, finally it causes paralysis.

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Spinal cord is an extension

of the brain in the vertebral

column and these diseases

may cause Paraplegia

(paralysis of both the lower

limbs or upper limbs and

bladder disorders).

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Motor Paralysis causes Hemi-plegia and similarly sensory paralysis also causes anaesthesis of half the body. Commonly occurring Cranial Nerves paralysis can damage eyes, vision and half of the face; i.e., facial paralysis.

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Paralysis of all four limbs.

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Paralysis of one.

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Sensitivity to pain.

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Pain results from a series of exchanges among three major components of your nervous

system:

Your peripheral nerves: These nerves extend from your spinal cord to your skin, muscles,

bones, joints and internal organs.

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Your spinal cord: The nerve fibers that transmit pain messages — such as the throbbing pain from that stubbed toe — enter the spinal cord in an area called the dorsal horn. There, they release chemicals (neurotransmitters) that activate other nerve cells in the spinal cord, which process the information and then transmit it up to the brain.

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Your brain: When news of your stubbed toe travels up the spinal cord, it arrives at the thalamus — a sorting and switching station deep inside your brain. The thalamus forwards the message simultaneously to three specialized regions of the brain: the physical sensation region that identifies and localizes the pain (somatosensory cortex), the emotional feeling region that experiences suffering (limbic system), and the thinking region that assigns meaning to the pain (frontal cortex). Your brain can respond to pain by sending messages to the spinal cord that modulate the incoming pain signals.

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Analgesics:

The absence of pain or sensation.

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Analgesics is a pain relieving medicine which works in a way that it relieves

pain by blocking the pain signals going to the brain. Other than that it also

relieves pain by interfering with the way the brain interprets the pain. This is

how it affects the nervous system.

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Thank you!7/18/2009

www.mayoclinic.com

www.boontobody.com

www.blurtit.com

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