Cranial Nerve 11

Aka: Cranial Nerve 11, Cranial Nerve XI, Accessory Nerve, Spinal Accessory nerve, CN 11

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II. Anatomy: Cranial Nerves 9-11

  1. neuroAccessoryCN11.png
  2. entCranialNerve9to11GrayBB791.gif Lewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
  3. entCranialNerve9to11GrayBB793.gif Lewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
  4. entCranialNerve9to11GrayBB794.gif Lewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)

III. Physiology

  1. Innervates Trapezius and Sternocleidomastoid motor

IV. Anatomy: Course

  1. neuroAccessoryCN11.png
  2. Arises in upper spinal cord (not Medulla)
  3. Passes up through foramen magnum
    1. Runs along side vagal nerve (CN 10) briefly
    2. Descends through jugular foramen
  4. Runs backward near Jugular Vein
  5. Descends to upper sternocleidomastoid
  6. Proceeds to posterior triangle of neck to trapezius

V. Exam

  1. Trapezius testing
    1. Patient raises Shoulders against resistance
  2. Sternocleidomastoid Testing
    1. Patient starts with head turned to the side
    2. Attempt to turn head back against resistance

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

Calculation (FPnotebook.com: DrBits) Open in New Window

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