Vascular Anatomy
Arterial Supply
Last Updated: April 1, 2025Major blood vessels of the Brain Internal carotid 4 big segments: o Cervical o Intrapetrosal o Intracavernous o Supraclinoid Ophthalmic (first branch) Retina Anterior Choroidal Optic tract – internal capsule (post limb) – cerebral peduncle Globus pallidus – LGB – hippocampus – amygdala – Thalamocortical pathway (would cause neglect) Posterior Communicating...
Internal Carotid Artery
Last Updated: April 1, 2025Branches Internal Carotid Artery Segments Branches C1 Cervical None C2 Petrous Vidian Caroticotympanic Anastomose with Vidian branch of Internal maxillary of ECA Anastomose with Inferior tympanic branch of ECA Both get enlarged in cases of aberrant ICA(congenital absence of C1 of ICA, ECA > Caroticotympanic/Vidian > C2 of ICA) C3 Lacerum None...
External Carotid Artery
Last Updated: April 1, 2025Branches External Carotid Artery Branches Intracranial Supply Superior thyroid None Ascending Pharyngeal Neuromeningeal branch dura and lower cranial nerves Lingual Facial Angular branch anastomosis with ophthalmic artery branches Occipital Anastomosis with vertebral artery segmental branches Superficial temporal Internal Maxillary Middle meningeal artery foramen spinosum supplies dura (anastomose with...
Anterior Cerebral Artery
Last Updated: April 1, 2025Anterior Cerebral Artery Branches ACA Segments Location Branches A1 Pre-communicating Lenticulostriate, recurrent artery of Huebner A2 From Acom to callosomarginal Orbitofrontal, frontopolar, A3 Continuation as pericallosal artery after callosomarginal origin Callosomarginal Continues as pericallosal A4 Small cortical branches Variants Variant Description A1 segment hypoplasia Both A2 segment arise from one side – in...
Posterior Cerebral Artery
Last Updated: April 1, 2025Branches Posterior Cerebral Artery Location Branches P1 Before PCOM origin PCOM anterior thalamoperforator (Tuberothalamic a) Posterior thalamoperforator P2 After PCOM origin P2A: while in the crural cistern P2P: after bridging to ambient cistern Middle posterior choroidal artery Lateral posterior choroidal artery Thalamogeniculate P3 Quadrigeminal cistern P4 Cortical branches Anterior...
VertebroBasilar Arteries
Last Updated: April 1, 2025Basilar Artery Branches Basilar Artery Branches Paramedian Supply medial third of pons, midbrain Short circumferential Supply lateral 2/3 of pons, midbrain AICA Anteroinferior cerebellum, floccular nodule, middle cerebellar peduncle, cranial nerves VII, VIII SCA Superior cerebellum Interpeduncular Supplies high midbrain and subthalamic Vertebral Artery Branches Vertebral Artery Branches Anterior Spinal Supplies spinal...