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Olfaction

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  • 1. OlfactionOlfaction The Sense of SmellThe Sense of Smell Gilmore S. Reyes Sherlaine T. Alcantara
  • 2. OlfactoryOlfactory(The Sense Of Smell)(The Sense Of Smell)  1: Olfactory bulb   2: Mitral cells   3: Bone  4: Nasal epithelium  5: Glomerulus  6: Olfactory receptor neurons
  • 3. Olfactory bulb   The olfactory bulb is a structure of the  vertebrate forebrain involved in olfaction, the perception of odors Olfactory Bulb
  • 4. Mitral cells  Mitral cells are neurons that are part of the  olfactory system. They are located in the olfactory bulb in the mammalian  central nervous system.
  • 5. Bone  Bones are rigid organs that constitute part of the endoskeleton of vertebrates.  They support and protect the various organs of the body especially its part.
  • 6. Nasal epithelium  Epithelium is one of the four basic types of  animal tissue, along with connective tissue, muscle tissue and nervous tissue. Epithelial tissues line the cavities and surfaces of structures throughout the body, and also form many glands.
  • 7. Glomerulus  The glomerulus (plural glomeruli) is a spherical structure located in the  olfactory bulbof the brain where synapses  form between the terminals of the  olfactory nerve and thedendrites of mitral, periglomerular and tufted cells.
  • 8. Olfactory Receptor NeuronsOlfactory Receptor Neurons is a transduction cell within the olfactory system. Carry impulses directly to the brainCarry impulses directly to the brain Live for 5- 8 weeks & then die.Live for 5- 8 weeks & then die.
  • 9. Trivia and Facts!Trivia and Facts!   Dogs 300-10,000 times more sensitive toDogs 300-10,000 times more sensitive to smell than humanssmell than humans  Why? Humans have 10-40 million olfactoryWhy? Humans have 10-40 million olfactory receptor neurons, dogs have over a billion!!receptor neurons, dogs have over a billion!!  female humans sense of olfaction is strongest around the time of ovulation, significantly stronger than during other phases of the menstrual cycle and also stronger than the sense in males
  • 10. How is perception affected byHow is perception affected by odor?odor?  Odor enhances our experience of the worldOdor enhances our experience of the world (food, surroundings, people).(food, surroundings, people).  We associate memories with certainWe associate memories with certain odorants.odorants.  We lose the ability to experience “flavors”We lose the ability to experience “flavors” if our sense of smell is impaired.if our sense of smell is impaired.  Most universally-rated “pleasant” odorant isMost universally-rated “pleasant” odorant is vanillavanilla
  • 11. AnosmiaAnosmia: loss of: loss of sensesense of smellof smell  May be toMay be to specificspecific odors orodors or allall odors.odors.  Caused by infection to nasal cavity or brainCaused by infection to nasal cavity or brain injury (frontal lobe).injury (frontal lobe).  About 2 million people in US are anosmic.About 2 million people in US are anosmic.
  • 12. END OF SLIDEEND OF SLIDE 