Gyri

Definition

Gyri are the ridges or folds found on the surface of the brain, specifically in the cerebral cortex. They increase the brain's surface area, allowing for a greater number of neurons and enhanced cognitive function.

5 Must Know Facts For Your Next Test

1. Gyri are separated by grooves known as sulci.
2. The precentral gyrus is involved in motor control and is located in the frontal lobe.
3. The postcentral gyrus plays a key role in processing sensory information from various parts of the body and is situated in the parietal lobe.
4. Gyri help to maximize the surface area of the cerebral cortex without significantly increasing brain volume.
5. Abnormalities in gyri formation can be associated with neurological conditions such as lissencephaly.

Review Questions

• What is the primary function of gyri on the cerebral cortex?
• How do gyri differ from sulci?
• Which gyrus is primarily responsible for motor control?

Related terms

Sulci: Grooves or furrows that separate adjacent gyri on the brain's surface.

Cerebral Cortex:

The outer layer of neural tissue of the cerebrum, involved in many higher-order functions like perception, thought, and decision-making.

Lissencephaly: A rare brain disorder characterized by a lack of normal gyri and sulci development, resulting in a smooth brain appearance.