Neurula (Gr. Neuron — Nerve)

Neuroula (from the Greek "neuron" - nerve) is an early stage of embryonic development at which the formation of the nervous system occurs. The neurula is one of the first structural elements to form during embryogenesis, and it plays an important role in the formation of the nervous system of the future organism.

The process of neurula formation begins in the 3rd week of embryo development. Initially, the embryo consists of three germ layers - endoderm, mesoderm and ectoderm. The neural tube is formed from the ectoderm, which at this stage begins to intensively divide and thicken.

Initially, the ectoderm forms a flat disc above the embryo sac. Then, as a result of development, a groove is formed in the center of this disk, which gradually moves along the disk, dividing it into two halves. These halves are then glued together to form a tube, the neural tube.

After the formation of the neural tube, its further development and differentiation occurs. The neural tube gives rise to all types of nervous tissue - the brain and spinal cord, nerves, ganglia, etc.

The neurula is a key structure that ensures the formation of the nervous system of the future organism. Disturbances in this process can lead to various pathologies of the nervous system, such as spinal defects, anencephaly and others.

In conclusion, the neurula is the developmental stage in which the initiation of the nervous system occurs. It is the initial stage in the formation of nervous tissue and plays an important role in the further development of the body. Thanks to neurula, we can understand how the nervous system is formed and how its disorders can affect health.