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Nervous systems (Neuroglia (Ependymal cells (Produces cerebral spinal…

- - - - Brain
        
        Composed of white and grey matter
        
        Sends and receives signals from cranial nerves and spinal cord
      - Spinal cord
        
        Composed of white and grey matter
        
        Sends and receives signals from spinal nerves and brain
    - - Grey matter
        
        Composed of neuron bodies and nonmyelinated axons
        
        Found primarily externally on the brain and internally in spinal cord
      - White matter
        
        Composed of myelinated axons
        
        External in spinal cord and internal in brain
      - Nucleus
        
        A group of neuron bodies in the CNS
        
        Forms the grey matter
- - - - sends and receives from the spinal cord
    - - Sends and receives from the brain
  - - - Somatic Sensory Fiber
        
        responsible for senses outside of the ventral body cavity
        
        Touch
        
        Pain
        
        Temperature
        
        Proprioceptors
        
        found in the Skin, body wall, and limbs
        
        Tells us where are body is in relation to itself
        
        Pressure
        
        Vibration
        
        Sensory receptors
        
        Special senses hearing vision and equilibrium
      - Somatic Motor fiber
        
        Controls skeletal muscle only
      - These nerves innervate almost everything outside of the ventral body cavity
        
        Limbs
        
        Skin
        
        Body wall
    - - Visceral Motor Fiber
        
        innervates smooth muscle and cardiac muscle and controls them
        
        Innervates exocrine glands and endocrine glands
        
        AKA autonomic because we can't control these things
      - Visceral sensory Fiber
        
        Stretch
        
        temperature
        
        Pain
        
        chemical changes
        
        irritation in viscera
        
        nausea
        
        Hunger
        
        Special senses: taste and smell
        
        Sensory receptors
      - Innervates the organs and the inside of the ventral body cavity and glands in the skin
  - - - Bundles of myelinated axons
    - - Groups of sensory neuron cell bodies in PNS
      - Found primarily in the Dorsal root of spinal nerve