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The bony structure you feel the the back of your neck is the backbone or vertebral column. It protects the spinal cord from injury. The spinal card is very important, as it is the extension of the brain. Its main function is to serve as a pathway of messages to and from the brain.
The spinal cord also serves as a reflex center. Sometimes, before a message could reach the brain, the spinal cord has already provided reflex action. It is an automatic response to something that happenes. An example is when you accidentally touch a hot object, your hand jerks away thinking about it. The spinal cord enables the body to react immrdiatly and protect itself from further
THE NERVE CELLS———————————————————————————————————————————————————————————————————
The nerve cells or neurons are the basic units of the nervous system. Their main function is to carry and collect messages, or nerve impulses. These impulses are relayed to the brain and sent back to the body part involved for proper action or reaction.
There are three types of nerves---sensory, motor, and connector nerves. the brain and spial cord receive nerve impulses from the different parts of the body through the sensory nerves. Then the brain and spinal cord send instructions of appropriate action to the invoelves body parts through the motor nerves. Connector nerves connect the sensory nerves and motor nerves and carry impulses between them.
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