Wikipedia offers an overall description of neurons. This site describes their physical appearance, the different parts of neurons, and what their functions are.

Detailed color images of the human brain, both normal and with various brain diseases, including Alzheimer's, Huntington's, multiple sclerosis, stroke, and AIDS dementia.

A good description of how the neurotransmitters are involved in cell communication. Very good site.

A general discussion of nervous system stem cells that lead to the neurons that make up the central nervous system. Decent site that is barely tangential to neurons in general.

Concise description of a neuron along with a graphic of the general structure. Links to the brain, neurotransmission, and neurotransmitters.

This article deals with the controversy around the regrowth of neurons in the central nervous system. Interesting facts relevant to neuron study.

From MedlinePlus, a video tutorial featuring information on Parkinson's Disease with accompanying text. Includes closed captioning option. [0:24]