Inferior frontal gyrus
The inferior frontal gyrus, or inferior frontal curl, is a structure of the frontal lobe of the cerebral cortex of the human brain. It can be divided into three parts, which in turn are separated by sulci. From rostral (front) to caudal (rear) these are the pars orbitalis , the pars triangularis and the pars opercularis . The three parts of the inferior frontal gyrus delimit the lateral sulcus from above.
Pars opercularis
The name of the structure is derived from the Latin operculum , which means something like "lid". If you remove the pars opercularis in a specimen like a "lid", you can see another cerebral structure: the insular cortex , also known as the insula or lobus insularis.
Pars triangularis
The name triangularis of the structure is derived from Latin and means "triangular", which, however, only roughly corresponds to the anatomical conditions of the pars triangularis. The pars triangularis on the dominant hemisphere is called the motor language center ( Broca language center ). It is indispensable for human communication, damage to this bark area can lead to extensive speech disorders up to and including being silent. It receives numerous afferents from other language centers such as the Wernicke center and the angular gyrus , which is of great importance for the process of speaking.
Pars orbitalis
The pars orbitalis rests on the bony orbit .
gallery
3D animation of the inferior frontal gyrus (red).
literature
- ^ Terminologia Anatomica . Federative Committee on Anatomical Terminology. Thieme, Stuttgart 1998