The gyrus (plural gyri, ( Latinized form of Greek γύρος, gyros and [ gy ː rɔs ] " round ", " bend ", " round ", " seam ", " edge ", here in the sense of " turn " ) is a term of the surface anatomy of the brain. shall constitute a protuding out of the brain mass gyrus
The individual gyri are separated by fissures ( grooves ) and sulci ( grooves ). Through these structures, the principle of surface enlargement is realized in the wholesale and the cerebellar cortex.
The formation of the gyri in humans is achieved already at the 24th week of pregnancy (SSW ), a complete Gyrierung is usually achieved with 32 weeks. The surface of the brain of a newborn is about 679 cm ², of which about 61% are within the sulci. With complete training of the gyri in adulthood increases the number and surface of the brain increases to about 1600 cm ².
Examples of the gyri
- Precentral gyrus
- Dentate gyrus
- Supramarginal gyrus
- Gyrus insularis
- Cingulate gyrus