Cranial Nerve 1

Aka: Cranial Nerve 1, Cranial Nerve I, Olfactory Nerve, CN 1, Olfactory Bulb

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II. Anatomy

  1. entOlfactoryNerveGrayBB771.gif Lewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
  2. entOlfactoryNervesGrayBB772.gif Lewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
  3. entOlfactoryNerveGrayBB858.gif Lewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
  4. neuroOlfactoryBulbGrayBB755.gif Lewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)

III. Course

  1. Olfactory tract divides into roughly 20 branches
  2. Perforates cribriform plate of the Ethmoid Bone

IV. Physiology

  1. Innervates olfactory mucosa
    1. Upper third of the nasal septum
    2. Superior nasal concha

V. Exam

  1. Precautions
    1. Ensure nasal patency
    2. Test one nostril at a time
    3. Avoid testing with noxious odors (e.g Ammonia)
      1. False Positives due to Trigeminal Nerve stimulation
  2. Ability to identify odors
    1. Coffee
    2. Cloves
    3. Peppermint

VI. References

  1. Gilman (1989) Manter and Gatz Essentials of Neuroanatomy and Neurophysiology, Davis, p. 87-113
  2. Goldberg (2014) Clinical Neuroanatomy, p. 24-39
  3. Netter (1997) Atlas Human Anatomy, ICON Learning, p. 110-129

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