Groups of cells in animals specialized in conduction of .
Nervous tissue includes (), various specialized neurons that serve as , and supporting cells (collectively , , or , such as ). Organs consisting of substantial amounts of nervous tissue include the , the , and the .
Nervous tissue, notwithstanding these specialized nervous system organs, nearly all in animal bodies.
, nervous tissue originates from .
Note that the following video is short, very informative, but also pretty heavy duty: