Question:medium
Site not affected in posterior cerebral artery infarct is?
Site not affected in posterior cerebral artery infarct is?
Show Hint
The pons is fed by pontine branches of the basilar artery, not the PCA.
Updated On: Jun 24, 2026
- Midbrain
- Pons
- Thalamus
- Striate cortex
Show Solution
The Correct Option is B
Solution and Explanation
Use the rule that the posterior cerebral artery looks after the back of the brain plus the deep grey matter fed by its perforators, while the pons keeps its own separate blood supply. Walk through the choices with that idea.
The occipital striate cortex is the showpiece of the posterior cerebral artery, so its loss gives the typical visual field cut and it is clearly within territory. The thalamus is nourished by perforating twigs (thalamoperforators and thalamogeniculates) that spring from the posterior cerebral artery, so thalamic damage fits. The midbrain sits at the basilar tip and shares perforators with the posterior cerebral artery, so it too can be struck. The pons, however, draws its supply from pontine branches coming straight off the basilar trunk, a vessel proximal to and distinct from the posterior cerebral artery. Therefore the pons stays out of the posterior cerebral artery picture.
\[\boxed{\text{Pons}}\]
The occipital striate cortex is the showpiece of the posterior cerebral artery, so its loss gives the typical visual field cut and it is clearly within territory. The thalamus is nourished by perforating twigs (thalamoperforators and thalamogeniculates) that spring from the posterior cerebral artery, so thalamic damage fits. The midbrain sits at the basilar tip and shares perforators with the posterior cerebral artery, so it too can be struck. The pons, however, draws its supply from pontine branches coming straight off the basilar trunk, a vessel proximal to and distinct from the posterior cerebral artery. Therefore the pons stays out of the posterior cerebral artery picture.
\[\boxed{\text{Pons}}\]
Was this answer helpful?
0
