ANATOMY

Detailed explanation-1: -There are three classes of neurons: Sensory neurons carry information from the sense organs (such as the eyes and ears) to the brain. Motor neurons control voluntary muscle activity such as speaking and carry messages from nerve cells in the brain to the muscles. All the other neurons are called interneurons.

Detailed explanation-2: -The most common brain cells are neurons and non-neuron cells called glia. The average adult human brain contains approximately 100 billion neurons, and just as many-if not more-glia. Although neurons are the most famous brain cells, both neurons and glial cells are necessary for proper brain function.