Basilar Artery

The basilar artery is formed by the joining of the two vertebral arteries at the pontomedullary junction. It ascends along the ventral midline of the pons and terminates near the rostral border of the pons by dividing into the two posterior cerebral arteries.

Middle cerebral

Superior cerebellar (cut) -

Basilar

Vertebral

Anterior spinal

Anterior communicating

Anterior cerebral

Internal carotid

Posterior communicating

Posterior cerebral

Anterior inferior cerebellar

Posterior inferior cerebellar

Anterior communicating

Anterior cerebral

Middle cerebral

Internal carotid

Posterior communicating

Superior cerebellar (cut) -

Posterior cerebral

Anterior inferior cerebellar

Posterior inferior cerebellar

Basilar

Vertebral

Anterior spinal

Branches of the basilar artery include: the labyrinthine artery, which follows the course of the eighth cranial nerve and supplies the inner ear; the anterior inferior cerebellar artery, which supplies part of the pons and the anterior and inferior regions of the cerebellum; the superior cerebellar artery, which supplies part of the rostral pons and the superior region of the cerebellum; pontine branches, which supply much of the pons via paramedian and circumferential vessels.

At the rostral end of the midbrain, the basilar artery divides into a pair of posterior cerebral arteries. Paramedian and circumferential branches of the posterior cerebral artery supply the midbrain.

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