![]() Neural signalling is an all-or-nothing action, whereas hormonal signalling is an action that can be continuously variable as dependent upon hormone concentration. Neural signals can be sent at speeds up to 100 meters per second. Neural signals can be transmitted much more quickly, in the range of milliseconds, than can hormonal signals, in the range of seconds, minutes, or hours. Motor neurons receive signals from the brain and spinal cord ans cause muscle contractions and affect glandular outputs. Sensory neurons respond to stimuli such as touch, sound or light and all other stimuli affecting the cells of the sensory organs that then send signals to the spinal cord and brain. Major components of the brain and spinal cord of the central nervous system (CNS), and of the autonomic ganglia of the peripheral nervous system. Neurons connect to each other to form neural networks. These signals between neurons occur via connections called synapses. ![]() It is the basic structural and functional unit of the nervous system. Nerve impulses to and from the brain travel as fast as 170 miles per hour.Ī neuron or nerve cell, is an electrically excitable cell that processes and transmits information through electrical and chemical signals. Vary in structure, size throughout the nervous system.Īxon length may vary from hundreds of microns to a meter. Topographically organized either as aggregates in nuclei or ganglia, or as columns or layers.
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