Nervous System

• Cell


  • body
  • Nucleus
  • Dendrile
• Peripheral Nervous System


  • Receives sensory information from the environment through the sensory neurons
  • The Sensory neurons send the Sensory Information to the C.N.S for interpretation
  • Motor neurons carry out the response
• Central Nervous System


  • Interneurons receive the Sensory information from the PNS
  • Interpret and decide what the response Should be
  • Motor neurons communicate this response to the muscles
• Nerves


  bundles of Neurons
• Neuron


  individual cells of the nervous system
• Sensory neurons


  Receive sensory information
• Motor neurons


  Connected to muscles and glands
• Brain


  • Spinal Cord
  • Interneurons
• Stimuli


  A Change in the internal and external environment
• Response


  Response to the Change in environment
• Motor nerve damage


  • Muscle weakness
  • Painful cramps
  • Muscle Spasms or twitches
  • Decreased refleres
  • Muscle Shrinkage
• Sensory nerve damage


  • Decrease in Sensation, impaired sense of feeling when touched
  • Loss of reflexes
  • Feeling of pain, tingling. or numbness
• Axon


  A long extension from the nerve cell at which Signals travel
• Dendrite


  A branch extending from a neuron that receives Signals from another neuron through a synapse
• Myelin Sheath


  Fatty Substance that Surrounds and insulates the axon. This helps Signals move through the neurons quickly
• Synapse


  The gap between branches extending from a neuron's axon that sends a Signal to the next neuron
• Neurotransmitter


  A type of protein Chemical that helps signals across the synapse