The nervous tissue is the source of communication throughout the body. Nervous cells are composed of neurons, specialized cells that allow communication throughout the body. Nervous tissues cannot replication, therefore, you are out of luck if one atrophies. Nervous tissues are found in the brain, spinal cord, and the peripheral nerves. There are neurons and neuroglia.
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Neuromuscular synapse, the junction between a motor neuron axon and a muscle fiber. TEM X9800
GALLERY: Images from Cajal's Butterflies of the Soul : The Beautiful Brain
Graphic of the Body's Glial Cells
Rat cerebellum showing Purkinje neurons (green), glia cells (red), and cell nuclei (purple). Confocal microscopy.
Santiago Ramón y Cajal Astrocytic Processes
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Anatomical position showing the cardinal planes and directional terminology
Only cardiac muscle has this particular appearance, which is given to it by something called intercalated discs. Cardiac muscle also consists of single muscle cells, called Cardiomyocytes; where something such as skeletal muscle cells are MULTInucleated (more than one cell nucleus).