Blood supply of medial surface of cerebral hemispheres is from?
**Core Concept**
The blood supply to the medial surface of the cerebral hemispheres is a critical aspect of cerebral circulation, ensuring the delivery of oxygen and nutrients to the brain's medial regions. The medial surface of the cerebral hemispheres is primarily supplied by branches of the anterior cerebral artery.
**Why the Correct Answer is Right**
The correct answer is related to the anatomy of cerebral circulation. The anterior cerebral artery (ACA) arises from the internal carotid artery and supplies the medial surface of the cerebral hemispheres, including the medial aspect of the frontal and parietal lobes. The ACA is responsible for supplying blood to the medial surface of the brain, including the corpus callosum, the anterior limb of the internal capsule, and the medial aspect of the frontal and parietal lobes. The ACA's branches, such as the anterior communicating artery and the pericallosal artery, also contribute to the blood supply of the medial surface.
**Why Each Wrong Option is Incorrect**
**Option A:** Not relevant to the blood supply of the medial surface of the cerebral hemispheres.
**Option B:** Not accurate, as the middle cerebral artery primarily supplies the lateral surface of the hemisphere.
**Option C:** Not correct, as the posterior cerebral artery supplies the occipital lobe and the posterior aspect of the temporal lobe.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the blood supply to the brain is highly specialized, and understanding the anatomy of cerebral circulation is crucial for diagnosing and managing various neurological conditions.
**Correct Answer: A. Anterior cerebral artery.**