The document discusses the posterior arterial circulation of the brain, including the arteries that supply blood to the brainstem and cerebellum. It outlines the main arteries - the vertebral arteries, basilar artery, posterior inferior cerebellar artery (PICA), and anterior inferior cerebellar artery (AICA) - and describes their segments and typical vascular territories. The document also notes there can be variations in the anatomy of these arteries and lists some references for further information.

1. Posterior arterial circulation of
the brain
Mohamed Elsayed Elsebaey, MD
Consultant Neurosurgery
Benha Teaching Hospital
The General Organization for Teaching Hospitals and
Institutes (GOTHI)
Arab Republic of Egypt
2022

12. Artery
Brain stem part
Cranial nerves
Cerebellar surface
Cerebellar fissure
Cerebellar peduncle

13. Segments:
1. Anterior ponto
mesencephalic
2. Lateral ponto
mesencephalic
3. Cerebello mesencephalic
4. Cortical

14. Segments:
1. Anterior pontine
2. Lateral pontine
3. Floculo peduncular
4. Divisions into restoral
and caudal branches

15. Segments:
1. Anterior medullary
2. Lateral medullary
3. Tonsillomedullary
4. Telovelotonsilar
5. Cortical

16. Segments:
1. P1 from basilar bif. To take of post.
Com. A
1. P2 P2A + P2P
2. P3
3. P4 calcarine

21. Variations of the vertebral artery

23. AICA
PICA
Variations

24. Variations of the Basilar artery

25. Variations of the Superior cerebellar artery

26. References
1. Albert L Rhoton. Cerebral arteries, chapter 2,
neurosurgery, volume 51 (1), 2002
2. Albert L Rhoton. Cerebellar arteries, chapter
2, neurosurgery, volume 47 (3), 2000
3. M.G Yasargil.book of Microneurosurgery,
volume 4, 2002