The lateral sulcus separates the temporal lobe from the parietal and frontal lobes.

The lateral sulcus separates the temporal lobe from the parietal and frontal lobes.

• A. Separates occipital from parietal.
• B. Separates temporal lobe from parietal and frontal lobes.
• C. Separates frontal from occipital.
• D. Separates cerebellum from brainstem.

Answer: (B)

The lateral sulcus, also known as the Sylvian fissure, is the deep groove on the brain’s lateral surface that marks the boundary between the temporal lobe and the frontal and parietal lobes. The temporal lobe sits below this fissure while the frontal and parietal lobes sit above and around it, so the fissure effectively separates the temporal lobe from both of the other two lobes. The insula lies tucked inside this fissure, which helps orient its location. Other boundaries are defined by different sulci—such as those separating occipital from parietal or the more medial separations—not by the lateral sulcus.

The lateral sulcus, also known as the Sylvian fissure, is the deep groove on the brain’s lateral surface that marks the boundary between the temporal lobe and the frontal and parietal lobes. The temporal lobe sits below this fissure while the frontal and parietal lobes sit above and around it, so the fissure effectively separates the temporal lobe from both of the other two lobes. The insula lies tucked inside this fissure, which helps orient its location. Other boundaries are defined by different sulci—such as those separating occipital from parietal or the more medial separations—not by the lateral sulcus.