The parafascicular nucleus (lat. nuclęus parafascićularis) is a special structure of the central nervous system of animals (bees, birds, rodents, mammals), which consists of cell groups. The core has the ability to be divided into several parts, each of which performs specific functions. The main task of this structure is the speed of reaction to the environment. This is due to the fact that individual kernel segments can be turned on or off depending on the situation. Thus, the animal is able to quickly and effectively respond to changes in the external environment.
For the normal functioning of the body, the core needs nutrition and oxygen. It is located in the area of the brain, near the retina, where neurons of various types are collected. The development of this nucleus can be observed at the stage when the membranes of the eye develop, practically without any therapy, because neither a child nor an adult experiences disturbances in the functioning of the nucleus during various physiological processes and external influences. In this case, the parafascicular nucleus plays a very important role