What is the first stage of brain development known as?

The first stage of brain development is known as induction. This stage occurs early in embryonic development when specific signals and interactions between cells lead to the formation of the nervous system. During induction, the ectoderm, the outer layer of the developing embryo, is influenced by underlying mesodermal tissues which activate the neural plate. This activation sets the foundation for subsequent processes in brain development, such as neural proliferation, migration, and the eventual establishment of complex neural networks.

Understanding induction is crucial because it highlights how the initial conditions and signals can profoundly impact the structure and function of the developing brain. This stage is therefore vital in establishing the basic framework that will guide further development through later stages, where processes like cell division (proliferation) and the movement of neurons to their final positions in the brain (migration) occur.