The medulla oblongata and cerebellum, occipital lobe, posterior temporal lobe, and thalamus are supplied by branches from which arteries?

• A. Frontal Lobe and Parietal Lobe
• B. Medulla oblongata and cerebellum, occipital lobe, posterior temporal lobe, and thalamus
• C. Spinal Cord
• D. Temporal Lobe only

Answer: (B)

The blood supply for these regions comes from the posterior circulation. Blood vessels in this pathway originate from the vertebral arteries, which merge to form the basilar artery, and then give rise to the posterior cerebral arteries.

• The medulla oblongata and cerebellum receive blood from branches of the vertebral and basilar arteries (such as the posterior inferior cerebellar, anterior inferior cerebellar, and superior cerebellar arteries).

• The occipital lobe and the posterior temporal lobe are mainly supplied by branches of the posterior cerebral arteries.

• The thalamus gets blood from multiple branches that originate with the posterior circulation, including thalamoperforating and related PCA branches.

So, those particular structures are fed by branches from the posterior circulation arteries (vertebral/basilar and posterior cerebral arteries), rather than by the anterior circulation (which serves frontal and parietal regions) or by the spinal cord alone or by the temporal lobe in isolation.