Spinal Cord, Spinal Nerves, Reflexes

• White matter

  
• Posterior column

  
• Lateral column

  
• Anterior column

  
• Gray matter

  
• Dorsal/Posterior horn

  
• Lateral horn

  
• Ventral/Anterior horn

  
• Anterior/ventral root of spinal nerve

  
• Posterior/dorsal root of spinal nerve

  
• Dorsal root ganglion (area that is enlarged on the dorsal root)

  
• Spinal nerve

  
• Anterior ramus/branch of spinal nerve

  
• Posterior ramus/branch of spinal nerve

  
• Spinal pia mater

  
• Spinal arachnoid mater

  
• Spinal dura mater

  
• Subarachnoid space

  
• Cervical plexus

  Phrenic nerve innervates the diagphram
• Brachial plexus


  Median nerve innervates some of the forearm flexors/pronators and thenar muscles
• Lumbar plexus


  Innervates the quadriceps femoris group
• Sacral plexus

  Innervates the hamstring group
• Parasympathetic

  - Digestion

  - Defecation

  - Diuresis

  - Decrease blood pressure, heart rate, respiratory rate
• Sympathetic

  fight or flight
• Reflex arc

  sensory receptor, sensory neuron, motor neuron, and effector that are involved in a quick response to a stimulus