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Autonomic nervous system Nerves that carry involuntary impulses to smooth muscle, cardiac muscle, and various glands Axon Carry impulses away from the cell body of a neuron. Brain Largest and most complex nerve tissue in the body Brain stem Monitors and control automatic functions of the body. Cerebellum Below the cerebrum it coordinates body movements Cerebrum The twisting mass of gray matter of the brain. Dendrite Receives impulses passed along from other neurons Impulses Electric signals that travel along neurons Interneurons Transmit signals between neurons Lobes Sections of the cerebrum that control different kinds of thoughts. Motor neurons Transmit information from the central nervous system to the muscles making them move. Myelin sheath Fatty coating that surrounds axons and increases the speed of impulses. Nerve A bundle of nerve fibers Nervous System Control center for the entire body Neuron Nerves cells that make up the nervous sytem Neurotransmitter Chemicals that are released in a synapse to transmit an impulse to a neighboring neuron Reflex An automatic response that occurs rapidly and without conscious control. Sensory neurons Transmit information from the outside world to the spinal cord or brain. Soma Cell body of a neuron Somatic nervous system Controls voluntary movements of skeletal muscles Spinal Cord Nerves that run up and down the length of the back and transmit most messages between the body and brain Synapse Fluid filled gap between a neuron and another cells where impulses are transmitted.