Nervous System

Electrochemical stimuli that travel from cell to cell as they send information from one area of the body to another

Cells that transmit impulses; identified as either afferent or efferent depending on the direction they travel

Cells that support neurons and bind them to other neurons or other tissues of the body; provide a variety of activities essential to the proper functioning of neurons

Carry or move inward or toward a central structure; refers to certain arteries, veins, lymphatic vessels, and nerves

Protective mechanism that blocks specific substances found in the blood-stream from entering delicate brain tissue

Network of nervous tissue found in the brain and spinal cord

Carry or move away from a central structure; refers to certain arteries, veins, lymphatic vessels, and nerves

Projection of a neuron, especially the axon that transmits impulses

Additional sheath external to myelin that is formed by Schwann cells and found only on axons in the peripheral nervous system

Chamber or cavity of an organ that receives or holds a fluid

1. cell body2. axon3. dendrites

The enlarged structure of the neuron that contains the nucleus of the cell and various organelles

--branching cytoplasmic projections that carry impulses TO the cell body--resemble tiny branches on a tree, providing additional surface area for receiving impulses from other neurons

--branching cytoplasmic projections that carry impulses FROM the cell body--long, single projections ranging from a few millimeters to more than a meter in length--transmit impulses to dendrites of other neurons as well as muscles and glands

Axons in the peripheral nervous system and the central nervous system