*Gyrus(gyri)-is a ridge on the cerebral cortex. Folds on the brain material. Many ridges called convolutions, or gyri, or gyrus, separated by grooves, mark the cerebrum's surface. *Sulcus(sulci)- shallow grooves on the brain.Generally, a shallow to somewhat deep groove is called a sulcus, or sulci, and a very deep groove is called a fissure.1  2 cerebral hemispheres:olds on the brain material. Many ridges called convolutions, or gyri, or gyrus, separated by grooves, mark the cerebrum's surface. *Sulcus(sulci)- shallow grooves on the brain. Generally, a shallow to somewhat deep groove is called a sulcus, or sulci, and a very deep groove is called a fissure. 1  2 cerebral hemispheres:
Most common pointing device on a notebook? The most common now is the touch pad. Prior to the touch pad, a stick pointer that looked much like a pencil eraser was more common; but the touch pad became more popular. Making the world better, one answer at a time.
Screwdrivers come in several designs, but the standard model with a flat head is still among the most common. See more pictures of hand tools. Every home should have at least one of the more popular screwdriver designs to tighten screws that come loose or need replacement. A screwdriver amplifies the hand's turning motion to the small, specially designed tip that is inserted into the screw's head. There are numerous tip designs for special applications (such as appliance assembly), but the two most common are standard (also called flat, flared, or straight) and Phillips (X-shaped) tips.