Nervous System

• 2 parts of the nervous system

  Central Nervous System (CNS)

  Peripheral Nervous System (PNS)
• Central Nervous System


  Brain + Spinal Cord

  
  

  Controls body from PNS order
• Peripheral Nervous System


  Somatic + Autonomic Nervous System

  
  

  All nerves communicate to the CNS from sensory neurons
• Somatic nervous system


  Concsiously aware actions

  
  

  Sensory (afferent) + Motor (efferent) neurons = Skeletal muscles
• Autonomic nervous system


  Sympathetic = readies body for threat

  e.g. Increases in heart rate, dilation of pupils

  
  

  Parasympathetic = day to day activities

  e.g. Homeostasis, heart rate

  
  

  Actions based atomatically
• Hypothalamus


  Located below Thamlmus + above pituritary gland

  
  

  Maintains Homeostatasis by relasing hormones + controls hunger, thirst, sleep

  
  

  Apart of the CNS
• Thalamus


  Above Hypohtalmus and brainstem

  
  

  Relay station for motor and sensory (except smell)signals to cerbral cortex

  
  

  Crucial for sleep + consciousness

  
  

  Apart of the CNS
• Medulla


  Lower part of brainstem, above spinal cord, below pons

  Autonomic functions: heartbeat, breathing, vomitting

  Part of CNS
• Pons


  Middle Part of Brainstem

  Relays signals between Cerebellum + Cerebrum = sleep, breathing, facial expressions
• Brainstem


  Contains: Midbrain, Medulla, Pons,

  Signal between brain + spinal cord.
• Motor Neurons


  Carries Impulses towards muscles