Diagrams showing different patterns of the circle of Willis, made from specimens of human brains.
- A - D - variations in the configuration of the anterior communicating artery are seen.
- B - F - the posterior communicating artery is the most Variable vessel, being asymmetric in its origin, diameters, and branches.
- C, D - Sometimes a branch from the posterior communicating artery parallels the anterior chorioidal artery, giving olf rami usually ascribed to the anterior chorioidal artery.
- E - the left posterior cerebral artery is a major branch of the internal carotid artery.
- F - the right posterior communicating artery is absent; the right anterior chorioidal artery branches from the right anterior cerebral artery; the arrow indicates a small aneurysm.
Circle of Willis (Willis' circle, loop of Willis, cerebral arterial circle, and Willis polygon) is named after Thomas Willis (1621–1675), an English physician.
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Abbreviations to figures
- Ant. cer. a., anterior cerebral artery
- Post. inf. cereb. a., posterior inferior cerebellar artery
- Ant. chor. a., anterior chorioidal artery
- Ant. com. a., anterior communicating artery
- Sup. cereb. a., superior cerebellar artery
- Vert. a., vertebral artery
- Ant. inf. cereb. a., anterior inferior cerebellar artery
- Ant. sp. a., anterior spinal artery
- Basil. a., basilar artery
- Int. and. a., internal auditory artery
- Int. carot. a., internal carotid artery
- Mid. cer. a., middle cerebral artery
- Post. cer. a., posterior cerebral artery
- Post. com. a., posterior communicating artery
- II, optic nerve
- III, oculomotor nerve
- V, trigeminal nerve
- VI, abducens nerve
- VII, facial nerve
- VIII, cochlear nerve
- IX, glossopharyngeal nerve
- X , vagus nerve
- XI, spinal accessory nerve
- XII, hypoglossal nerve
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