CIRCLE OF WILLIS-ANTERIOR CEREBRAL ARTERY (ACA)

SUMMARY

ORIGIN
1. The ACA leaves the ICA at the anterior perforated substance and passes above the optic nerve
2. It is distributed to the orbital surface of the frontal lobe and medial surface of the hemisphere up to the parieto-occipital sulcus

SUPPLY
3. Motor & sensory areas of the legs, perineum
4. Micturition & defecation centers

BRANCHES
5. Medial lenticulostriate a. (from A1 segment)
6. Recurrent Artery of Heubner (from A2 segment)



Image: Circle of Willis. Netter. (2014). Atlas of Human Anatomy, Sixth Edition. 6th ed. Elsevier.

Reference(s)

R.M.H McMinn (1998). Last’s anatomy: regional and applied. Edinburgh: Churchill Livingstone. Get it on Amazon.
Drake, Richard L., et al. Gray's Anatomy for Students. Elsevier, 2023. Get it on Amazon.