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Chemical Sense: Smell (Olfaction)

Smell is also known as olfaction.  The receptors are classified as chemoreceptors because they respond to airborne chemicals that dissolve in fluids of the nasal mucosa.

Our nasal cavity is lined with mucous membrane and you could see the olfactory bulb is just behind the cribriform plate.

Olfactory Epithelium covers the superior nasal concha and superior part of the nasal septum.  The nasal concha are simply bony protrusions that increase the surface area of these cavities, providing for rapid warming and humidification of air as it passes to the lungs.

The olfactory gland secretes mucus for dissolving odor molecules.  Olfactory epithelium is made up of pseudostratified columnar epithelium.  Remember the lamina propria is just thin connective tissue found underneath the epithelial tissue of mucosa membranes to act as support.

Filaments of olfactory nerve are just bundled axons.  The basal cells differentiate into new olfactory neurons.  There are millions of the olfactory sensory neurons.  The olfactory cilia actually don’t move much, they are particularly for sensing odor molecules, not moving stuff.

click for the larger image

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

The Autonomic Nervous System

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

YOU ARE HERE AT THE SPECIAL SENSES

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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