The Nervous System (NS)

Annotations:

• Consists of nerves that connect the brain and spinal cord to other parts of the body.

1. Autonomic NS (ANS)

   Annotations:

   • Regulates involuntary or "automatic" functions. Conducts impulses from the spinal cord or brainstem to cardiac muscle, smooth muscle, and glandular epithelial tissues. 
   1. Sympathetic NS

      Annotations:

      • Emergency system designed for "fight" or "flight" responses. Reacts to any sort of stress on the body.
   2. Parasympathetic

      Annotations:

      • Counterbalances the sympathetic nervous system. Responsible for digestion and other visceral processes.
2. Somatic NS

   Annotations:

   • Motor nerves control voluntary actions of skeletal muscle.

Annotations:

• Centrally located. Protected by meninges, skull, vertebral column.

1. Brain
   1. Forebrain
      1. Telencephalon
         1. Cerebral cortex
         2. Basal ganglia
         3. Hippocampus
         4. Amygdala
      2. Diencephalon
         1. Thalamus
         2. Hypothalamus
   2. Hindbrain
      1. Metencephalon
         1. Pons & Cerebellum
      2. Myelencephalon
         1. Medulla
   3. Midbrain
      1. Mesencephalon
         1. Tectum
         2. Cerebellum
2. Spinal Cord