The Nervous Journey (from askabiologist)
The Nervous System (by Part 1 by Crash Course-YT; overview of the different major parts of the nervous system & to different types of neurons)
A) How Nerve signal transmission happens (Action Potential and the synapse)
Action Potential in the Neuron (by Harvard Extension School – YT)
The Action Potential (Nervous system Part 2 by Crash Course)
Transmission Across the Synapse (animation) and Synapse Self-Quiz 1 and Synapse Self Quiz 2
The Synapses (Nervous System Part 3 by Crash Course)
B) The Central Nervous System
Here is nice summary from askabiologist about the Parts of the brain https://askabiologist.asu.edu/parts-of-the-brain
C) The Peripheral Nervous System
Crash Course Series:
The Peripheral Nervous System (PNS) which are the nerves in your body that is not in the Central Nervous System (CNS)
An overview of the The Autonomic Nervous System which is made up of the Sympathetic Nervous System which works with the Parasympathetic Nervous System .