The brain contains over 100 billion neurons, all of which work together in a delicately balanced symphony. Neurons are brain cells that process and transmit information by electrochemical signaling. Messages regarding external stimuli, emotion, muscle command and other sensory cues are sent along to the next neuron across a synaptic gap. Some neurons have direct contact with as many as 10,000 adjacent neurons. Billions of them are involved in every thought or action we undertake, no matter how simple. Regular use of mood altering drugs upsets the delicate balance our brain strives to maintain. One of 100 billion Neurons that send signals through the human brain