label: Undersurface of the Frontal Lobe
label_lc: undersurface of the frontal lobe
description: "The inferior orbital portion of the prefrontal cortex that is concave and rests on the orbital plate of the frontal bone; it is divided into four gyri by a well-marked, H-shaped orbital sulcus: the medial, the anterior, the lateral, and the posterior orbital gyri."