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All voluntary movement in the body is controlled by the brain. Nerve cells in the brain, called upper motor neurons, initiate movement through the release of chemical signals called neurotransmitters. The signal is passed from the upper motor neurons to the lower motor neurons of the spine.

Nerve fibers extending from the spine, called axons, extend into the muscles. The point where the axons and muscle fibers connect is called the neuromuscular junction. When the ... more