Nervous System (NS)

Nervous System (NS)

1. Central Nervous System (CNS)

   • Spinal Cord
     • Cervical
       • Thoracic
         • Lumbar
           • Sacral
             • Coccygeal
         • Injury: Paraplegia
       • Injury: Quadriplegia
   • Brain
     • Forebrain
       • Hypothalamus
       • Thalamus
       • Basal Ganglia
       • Limbic System
     • Midbrain
       • RAS
       • Substantia Nigra
     • Hindbrain
       • Medulla Oblongata
       • Pons
       • Cerebellum

2. Peripheral Nervous System (PNS)

   • Autonomic Nervous System (ANS)
     • Sympathetic NS
       • "Gas" "Accelerates"
         • Prepares for "fight-or-flight"
           • e.g., increased HR, pupil dilation, conversion of energy stores (fat and glycogen) to glucose
     • Parasympathetic NS
       • "Brakes" "Deactivates"
       • Responds to SNS creating states of relaxation
         • e.g., decreased HR, activation of digestion & elimination, conversion of glucose to energy stores (glycogen & fat)
     • Regulates Involuntary Movements
       • e.g., Digestion, Respiration, Heartbeat & Autonomic Arousal
   • Somatic Nervous System (SNS)
     • Voluntary Movement
       • Relays signals from senses
         • Controls Skeletal Muscles
   • Afferent Nerves - "Sensory or Receptor" nerves, carry info from SENSE ORGANS to CNS
   • Efferent Nerves - "Motor or Effector" nerves, carry info from CNS to MUSCLES & GLANDS

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