Which identify spaces that are roughly PERPENDICULAR in the human brain?

Sulci and gyri are the primary anatomical structures that identify spaces that are roughly perpendicular in the human brain.

- Sulci are the grooves or indentations on the surface of the brain, while

- Gyri are the ridges or elevations between the sulci.

Sulci and gyri are arranged in a roughly perpendicular fashion, with sulci running primarily in a horizontal or frontal plane and gyri running primarily in a vertical or lateral plane. This arrangement creates a grid-like pattern on the surface of the brain.