Introduction - from your book.
Nervous tissues are found in the brain, spinal cord, and peripheral nerves. The basic cells are called neurons (nerve cells). Neurons are sensitive to certain types of changes in their surroundings. They respond by transmitting nerve impulses along cellular extensions (nerve fibers) to other neurons or to muscles or glands. Because neurons communicate with each other and with various body parts, they coordinate, regulate, and integrate many body functions.
Here are two pictures of neurons (black arrows). Neurons are individaul nerve cells.
Nerve - specifically, the spinal cord.
Nerves are collections of neurons and the largest nerve in the body is the spinal cord. There are many hundreds of neurons in this picture.
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