Anatomy

Circle of Willis

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Circle of Willis

  • Anatomy
  • Background
  1. Circle of Willis forms a collateral communication between the Anterior Circulation and the Posterior Circulation
  2. Anterior Communicating Artery
    1. Connects anterior cerebral arteries together
  3. Posterior communicating arteries (2)
    1. Connects each internal carotid to Basilar Artery
  • Anatomy
  • Goldberg's Circle of Willis Analogy to a Cartoon Spider
  1. Background
    1. Stephen Goldberg , MD describes a brilliant memory aid for the Circle of Willis
    2. Cartoon Spider (named Willis) represents the cerebral Vascular Anatomy
    3. Anatomy is as if viewed from below
      1. Looking up at the inferior brain surface (Brainstem, pons and Optic Chiasm)
  2. Top of Willis head
    1. Anterior Cerebral Artery
    2. Anterior Communicating Artery
  3. Willis Face
    1. Optic Chiasm (eye brows)
    2. Internal Carotid Artery (eyes)
    3. Middle Cerebral Artery (?antenna)
    4. Pituitary Gland (nose)
    5. Mammilary Body (mouth)
    6. Posterior Communicating Artery (jaw line)
  4. Willis Arms
    1. Posterior Cerebral Artery
    2. Cranial Nerve 3 (axilla)
    3. Superior Cerebellar Artery
  5. Willis Body
    1. Pons (trunk)
    2. Basilar Artery (spine)
  6. Willis Legs
    1. Anterior Inferior Cerebellar Artery
    2. Vertebral Artery
    3. Posterior Inferior Cerebellar Artery
  7. Willis Genitalia
    1. Anterior Spinal Artery (penis)
  8. Images
    1. http://lifeinthefastlane.com/a-spider-called-willis/
  9. References
    1. Goldberg (2014) Clinical Neuroanatomy, Medmaster, p. 6-15
  • Anatomy
  • Images Circle of Willis
  1. neuroCvCircleWillisGrayBB516.gif Lewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
  2. neuroCvCircleWillisGrayBB519.gif Lewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
  • References
  1. Gilman (1989) Manter and Gatz Essentials of Neuroanatomy and Neurophysiology, Davis, p. 216-21
  2. Goldberg (2014) Clinical Neuroanatomy, Medmaster, p. 6-15
  3. Netter (1997) Atlas Human Anatomy, ICON Learning, p. 130-9