Most common site of cerebral infarction is in the territory of
**Core Concept**
The cerebral circulation is divided into several territories, each supplied by a specific branch of the major cerebral arteries. Cerebral infarctions occur when there is a blockage or reduction in blood flow to a particular area of the brain, leading to tissue damage and neurological deficits.
**Why the Correct Answer is Right**
The most common site of cerebral infarction is in the territory supplied by the middle cerebral artery (MCA). This is because the MCA is the largest of the cerebral arteries and supplies a significant portion of the lateral surface of the brain, including the motor and sensory cortices. The MCA is also more susceptible to atherosclerotic disease and thrombosis, which are common causes of cerebral infarction. The MCA's territory includes the frontal, parietal, and temporal lobes, and infarctions in this area can result in a range of neurological deficits, including weakness, sensory loss, and speech and language disturbances.
**Why Each Wrong Option is Incorrect**
* **Option A:** The anterior cerebral artery (ACA) supplies the medial surface of the brain, including the medial frontal and parietal lobes. While ACA infarctions can occur, they are less common than MCA infarctions.
* **Option B:** The posterior cerebral artery (PCA) supplies the occipital lobe and the posterior portion of the temporal lobe. PCA infarctions are less common and typically result in visual disturbances.
* **Option D:** The basilar artery supplies the brainstem, cerebellum, and posterior inferior cerebellar arteries. While basilar artery occlusion can occur, it is less common than MCA occlusion.
**Clinical Pearl / High-Yield Fact**
The MCA territory is also known as the "lateral hemisphere" and includes the areas responsible for motor control, sensation, and language. Infarctions in this area can result in significant neurological deficits, making prompt recognition and treatment critical.
**Correct Answer: A. Middle cerebral artery territory.**