Histology of Nervous Tissue

1) Neuron 2) Supporting cells- smaller cells that surrounds and wrap the more delicate neurons.

Neuroglial cells- (glial cells) Are nonexcitable cells of neural tussue. Not able to generate and transmit nerve impulse. Neuron- (nerve cells) Are excitable cells, specialized to generate and trasmit electrical signals

The epidemal cells.

Function in production of cerebral spinal fluid. (CSF)

Are receptive regions. Provide enormous surface area for recieving signals. Diffusing branching extensions.

Axons generate and conduct nerve impulses. Conduct impulses away from cell body.

Nissel bodies are rough endoplasmic reticulum, are involved in metabolic activities of the cells. Orderly arranged for protein synthesis, for neuron growth, and regeneration of nerve fibers.

Synapse is junction w/ neurons or effector cells. Functional junction or point of close contact between (2) neurons or between a neuron and an effector cell.

Myelin is made of insulating fatty sheath of schwann. Made by individual schwann cells.

1) Dramatically increase the speed of impulse 2) Act as insulator w/ the fatty material 3) Prevent leakage of charge out of the axon. Wrapping/surround larger PNS axons.

The peripheral part of the Schwann cell and its plasma membrane.

Neurilemma surrounds neural cells. surrounds the axons fo peripheral nerve.

Nodes of Ranvier are unmelinated gaps between schwann cells, along the nerve fibers. These gaps are where axons contain most of their channels, speed up conduction along axons,

The nodes of Ravier work with the myelin sheath to increase speed of conduction.

Classification of neurons based on structure # of processes extending from cell body. Structural variation within classes maybe differentiated according to # of processes attached to cell body.