Occlusion of which of the following blood vessels can result in hemiplegia?
**Core Concept**
Occlusion of a specific blood vessel in the brain can lead to hemiplegia, a condition characterized by paralysis of one side of the body. This occurs due to the interruption of blood flow to the motor cortices responsible for controlling voluntary movements.
**Why the Correct Answer is Right**
Hemiplegia typically results from occlusion of the middle cerebral artery (MCA), which supplies a large portion of the lateral surface of the brain, including the motor cortices. The MCA is the largest cerebral artery and is responsible for supplying blood to the majority of the lateral surface of the brain, including the motor cortices responsible for controlling voluntary movements. Occlusion of the MCA can lead to ischemia of the affected hemisphere, resulting in hemiplegia. The MCA's territory includes the motor cortex, which is responsible for controlling voluntary movements, making it a critical area for motor function.
**Why Each Wrong Option is Incorrect**
**Option A:** The anterior cerebral artery (ACA) primarily supplies the medial surface of the brain, including the motor cortices responsible for controlling leg movements. Occlusion of the ACA is less likely to result in hemiplegia.
**Option B:** The posterior cerebral artery (PCA) primarily supplies the occipital lobe and parts of the temporal lobe. Occlusion of the PCA is less likely to result in hemiplegia.
**Option C:** The vertebral artery primarily supplies the brainstem and cerebellum. Occlusion of the vertebral artery is less likely to result in hemiplegia.
**Clinical Pearl / High-Yield Fact**
When assessing a patient with hemiplegia, it's essential to consider the potential vascular territories affected, including the MCA, ACA, and PCA. A thorough neurological examination and imaging studies can help identify the affected vessel and guide treatment.
**Correct Answer:** C. Middle cerebral artery (MCA).