GENERAL HISTOLOGY

Detailed explanation-1: -The thin layers of cells cover the cerebral hemispheres called cerebral cortex. The elevated ridges of tissue on the surface of the cerebral cortex are known as gyri while the shallow grooves are termed sulci.

Detailed explanation-2: -In addition to the large size of the cerebral hemispheres (about 85 percent of the brain by weight), their surface is highly convoluted. The ridges of these convolutions are known as gyri (singular, gyrus), and the valleys between them are called sulci (singular, sulcus) or, if they are especially deep, fissures.

Detailed explanation-3: -The cerebral cortex has sulci (small grooves), fissures (larger grooves) and bulges between the grooves called gyri.

Detailed explanation-4: -The surface of the cerebrum is known as the cortex. It is about two-millimeter-thick and has many folds forming ridges (gyri) and grooves (sulci). A fissure is a deeper grove and is often used interchangeably with sulcus.

Detailed explanation-5: -Sulci, the grooves, and gyri, the folds or ridges, make up the folded surface of the cerebral cortex.