how long does brain development occur
Brain Development. The brain grows at an amazing rate during development. At times during brain development, 250,000 neurons are added every minute! At birth, almost all the neurons that the brain will ever have are present.However, the brain continues to grow for a few years after birth. By the age of 2 years old, the brain is about 80% of the adult size.he Brain During Development. The nervous system develops from embryonic tissue called the ectoderm. The first sign of the developing nervous system is the neural plate that can be seen at about the 16th day of development. Over the next few days, a trench is formed in the neural plate-this creates a neural groove.