THE NERVOUS SYSTEM I

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THE NERVOUS SYSTEM I
Warm-up 4/9 What are the 4 main types of
tissues. Describe each.

• pp. 1003-1015

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FUNCTION

• network of cells (neurons) that communicate and
  control the body through electrical impulses
• Includes neurons (cells that carry messages),
  brain and spinal cord

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CENTRAL NERVOUS SYSTEMCNS

• Brain control center with different sections
  controlling different parts of the body
• Spinal cord column of nerve tissue that acts as
  a communication link between brain and Peripheral
  NS.

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PERIPHERAL NERVOUS SYSTEM PNS

• carries impulses to and from the CNS.
• Motor division (reacts to sensory input)
• 1. somatic nervous system (voluntary)
• transmits impulses to and from skeletal
• muscle

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• 2. Autonomic nervous system (involuntary)
  controls glands, internal organs, and other
  smooth muscle tissue.

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NEURONS
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• 1. Axons extension of cell body
• 2. Axon terminal end of the axon
• 3. Dendrites receive action potentials
  (electrical impulse/message) from other neurons
• 4. Synapse gap between neurons
• 5. Myelin sheath lipid layer around axon
  (insulator)
• 6. Schwann cells produce myelin sheath

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TYPES OF NEURONS

• sensory sense organs/receptors to CNS.
• motor CNS to muscles/glands.
• interneurons connect sensory and motor and
  carry impulses between them.

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homework

• Cover Page Physio
• Read pp. 1003-1015
• P 1015 1-6, 8