Which structure divides the posterior occipital lobe into superior and inferior sections?

Which structure divides the posterior occipital lobe into superior and inferior sections?

• A. Calcarine fissure
• B. Sylvian fissure
• C. Parieto-occipital fissure
• D. Occipital notch

Answer: (A)

Calcarine fissure is the deep groove along the medial surface of the occipital lobe that splits the primary visual cortex into two halves: the area above the fissure (cuneus) and the area below (lingula). This anatomical boundary creates the superior and inferior portions of the posterior occipital lobe. The other landmarks sit in different locations or serve other boundaries (for example, the Sylvian fissure is on the lateral surface, the parieto-occipital fissure marks the border between parietal and occipital lobes, and the occipital notch is just a small external feature).

Calcarine fissure is the deep groove along the medial surface of the occipital lobe that splits the primary visual cortex into two halves: the area above the fissure (cuneus) and the area below (lingula). This anatomical boundary creates the superior and inferior portions of the posterior occipital lobe. The other landmarks sit in different locations or serve other boundaries (for example, the Sylvian fissure is on the lateral surface, the parieto-occipital fissure marks the border between parietal and occipital lobes, and the occipital notch is just a small external feature).