Getting on your Nerves. What a lot of nerve!. There are about 100,000,000,000 neurons in an adult human. These form 10,000,000,000,000 synapses, or connections They represent 2 % of the body’s weight , 0.04-0.07% cells and 20-44% of the body’s power consumption 50,000 neurons die each day.
(which is closely related to their function)
Action on other neurons (excitatory or inhibitory)
Type of neurotransmitter (pathway)
Patterns of firing