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Visceral Sensory Neurons and Referred Pain

Now we will cover the visceral sensory neurons which have nothing to do with the autonomic nervous system and nothing to do with motor-related-stuff which we talked about before this.

These are the neurons that monitor stretching, temperature, chemical changes and irritation.  The cerebral cortex in the brain interprets these sensations as things such as hunger, fullness, pain, nausea, gas, cramping, etc.

The cell bodies are located in the dorsal root ganglia and the fibers travel together with the autonomic nervous system.  Since it piggybacks the autonomic nervous system, we get something called referred pain.  For example, pain from the heart can be perceived on the left shoulder and arm.  An ice-cream headache, also known as brain freeze, is another example of referred pain.  When something very cold touches the roof of the mouth (palate), the vagus and trigeminal nerves respond by causing rapid constriction and swelling of capillaries in the sinuses, “referring” the pain from the roof of the mouth to the head.

Any organ that is having an issue will create sensations of discomfort in the body where the skin is innervated by the same spinal segments.  One possible reason for this is because the ANS and spinal nerves may travel together and be misinterpreted by the cerebral cortex.  Another reason for this is that the reflexive vasoconstriction of capillaries affects and involves the dermatomes.

Use this Table of Contents to go to the next article

Painting by Michael Reedy
The Basics. Start here. This is your Foundation.
  • Intro to human anatomy
  • The building blocks of cells

Epithelial and Connective Tissue

  • Basics of Epithelial Tissue
  • Eight types of Epithelial Tissue
  • Detailed Features of Epithelia
  • Connective Tissue Basics
  • Three Types of Membrane

Skin, Hair, Nails, Sweat Glands

  • Integumentary System Part 1
  • Integumentary System Part 2

The Skeletal System

  • Cartilage and Bones
  • Geography of the Skull
  • Special parts of the skull
  • The Vertebral Column
  • Thoracic Cage, Ribs, Fontanelles

The Muscular System

  • Muscles of the Head
  • Muscles of the Neck and Vertebral Column
  • Muscles of the thorax for breathing and the pelvic floor (The Diaphragm)
  • Muscles of the Abdominal Wall
  • Muscles of the Forearm

The Central Nervous System

  • Fundamentals of the Nervous System and Nervous Tissue
  • CNS: Intro to Brain and Ventricles, Medulla Oblongata, Pons, Mid-Brain and Cerebellum
  • Central Nervous System: Spinal Cord
  • The Diencephalon
  • The Cerebral Hemispheres
  • Functional Areas of The Cerebral Cortex
  • Cerebral White Matter and Gray Matter and Basal Ganglia
  • The Limbic System and the Reticular Formation
  • Protection for the Brain: Meninges, CSF, Blood-Brain Barrier
  • Disorders of the Central Nervous System

The Peripheral Nervous System

  • Peripheral Nervous System: Cranial Nerves
  • Peripheral Nervous System: Spinal Nerves and Plexuses
  • Innervation of the skin: Dermatomes

YOU ARE HERE AT THE ANS

The Autonomic Nervous System

  • The Autonomic Nervous System (Includes sympathetic and parasymphathetic systems)
  • Visceral Sensory Neurons and Referred Pain

Special Senses

  • Chemical Sense: Taste (Gustation)
  • Chemical Sense: Smell (Olfaction)
  • The Eye and Vision

The Cardiovascular System

  • Intro to the Heart
  • Blood Flow of the Heart (Circulation Flow)
  • Myocardium
  • Conducting System of the Heart (Nervous Impulse Flow)
  • The Four Corners of the Heart
  • Layers of the Pericardium, Heart Wall and Spiral Arrangement
  • Function of the Atrioventricular and Semilunar Valves
  • Blood Components, Hemoglobin, Type/Rh Factor, Agglutination
  • Blood Vessels

Specialized Systems

  • The Endocrine System (Pituitary, Thyroid, Pancreas, Adrenal, Gonads, etc)
  • The Lymphatic System (Spleen, Thymus, Lymphatic vessels, nodes etc)
  • The Respiratory System (Lungs, Alveoli, Bronchi, Trachea, Larynx, Nasal cavities, etc)
  • The Immune System
  • The Urinary System: Kidneys
  • The Urinary System: Ureter and Urinary Bladder

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