Posterior Circularion VA, BA , PCA

Question 1

VA segment 4

Answer 1

v1 and V3 mobile and vulnerable to dissection

Question 2

VA branches 6

Answer 2

Anterior menineal arise V3
Posterior meningeal
Anterior spinal
Postior spinal
Medullary bulbar A
PICA largest ⭕️

Question 3

PICA segment 5

Answer 3

anterior medullary ➡️ 🚪 CN XII, branch short medullary circumflex branches ⇒ ventral medulla
Lateral medullary ➡️ 🚪 CN X, IX,XII , 5 branches that supply brainstem
tonsillomedullary ➡️ cadual loop 🔽🔁
⬆️ first three segment must preserve
telovelotonsillar (supratonsillar)➡️ cranial 🔼🔁 BRANCH 1 choroidal a. To 4th V and CPx
cortical segments
Terminal BRANCH at the level of tonsillomedullary

Medial trunk ➡️➡️ inferior vermian (BRANCH 3) inferior inflection = copular point on angio
Lateral trunk ➡️➡️ tonsillohemispheric

Question 4

BA branches 5

Answer 4

AICA 🚪anterior to VI,VII,VIII

internal auditory (labyrinthine)
Pontine

superior cerebellar a. (SCA) ➡️ sup vermin A
PCA with 4 segment

Question 5

PCA segment

Answer 5

peduncular segment (P1) 3 branches ➡️ mesencephalic perforating aa., interpeduncular thalamoperforators, medial post. choroidal,,, variant ( artery of Percheron)

ambient segment (P2) ➡️ lateral post. choroida , thalamogeniculate thalamoperforators, anterior & posterior temporal #️⃣ (MCA ), parieto-occipital , calcarine

quadrigeminal segment (P3) 2 b ➡️ quadrigeminal & geniculate branches, post. pericallosal (splenia #️⃣ ACA )