The brainstem and cerebellum receive most of their blood supply from which of the following arterial branches?
A. Internal carotid and posterior cerebral
B. Vertebral and middle cerebral
C. Vertebral and basilar
D. Internal carotid and basilar
ANS: C
Rationale: Branches of the vertebral and basilar arteries provide blood supply to the brainstem and cerebellum. These branches include the anterior and posterior spinal arteries (medulla), posterior cerebral arteries (midbrain), posterior inferior cerebellar arteries (medulla and cerebellum), and anterior inferior and superior cerebellar arteries (pons and cerebellum).
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