The medical field of neurology studies illnesses and abnormalities of the neurological system. The word neurology is derived from the Greek terms “logia,” which means “the study of,” and “neuron,” which means nerve.

The brain has about 100 billion neurons, each of which is able to produce its own impulses as well as receive and send impulses from nearby cells. Studying neurology include investigating:

the three neural systems: the autonomic, peripheral, and central nervous systems.
abnormalities of the nervous system’s structure and function, ranging from birth defects to degenerative illnesses like Alzheimer’s and Parkinson’s.