To stay in balance, the brain depends on two types of neurons: Excitatory neurons (in white), which increase activity, and inhibitory neurons (in black), which damp down signals. Scientists have now ...

The fetal nervous system — i.e., your baby's brain, spinal cord, and nerves — is one of the very first systems to develop. In fact, it's making big strides before you even know you're pregnant. Fetal ...