Cerebrum: a mass of tissue that embodies not only attributes particular to humans such as speech and self awareness but also sensory perception, motor abilities and memory. Cerebral cortex: contains about 90% of the brain"s cell bodies neurons and synapses. Most neurons are present in the brain by the seventh month of gestation. During the embryonic period, neurons multiply at a very rapid pace in a process call neuron proliferation. The adult brain has the capacity to regenerate nerve cells. Glial cells: provide neurons with structural supports and regulate their nutrient and repair neural tissue, some of them are also responsible for cell myelination. Myelination occurs during the first 2 years of life all the way to adulthood they allow for quicker transmission of messages. Neural migration: ensures that all parts of the brain are served by a sufficient number of neurons. The absence of neurons can be associated with mental disorders such as dyslexia or schizophrenia.