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Khan Academy
Khan Academy: Neuron Action Potentials: The Creation of a Brain Signal
Explains how neurons work during the formation and transmission of brain signals.
OpenStax
Open Stax: Anatomy and Physiology: The Function of Nervous Tissue
Learn here about how nervous tissue is capable of communicating within the nervous system.
OpenStax
Open Stax: Anatomy & Physiology: The Sensory and Motor Exams
Students learn the arrangement of sensory and motor regions in the spinal cord in order to understand a sensory and motor exam. They will also understand the clinical indications of common reflexes.
University of Wisconsin
The Why Files: Bolt on Brain Repairs
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.