Central nervous system (CNS) - Serves as the primary control center for processing and coordinating sensory information and motor commands., Peripheral nervous system (PNS) - Includes all the nerves outside the CNS, connecting it to the rest of the body to relay sensory and motor information., Autonomic nervous system (ANS) - Regulates involuntary bodily functions, such as heart rate, digestion, and respiration, through its sympathetic and parasympathetic divisions., Somatic nervous system (SNS) - Controls voluntary movements and transmits sensory information from the skin, muscles, and joints to the CNS., Afferent nerves - Carry sensory signals from the body to the CNS for processing., Efferent nerves - Transmits motor commands from the CNS to muscles and glands to elicit responses., Sympathetic system - A division of the ANS responsible for the "fight-or-flight" response, increasing heart rate, dilating pupils, and redirecting blood flow to muscles., Parasympathetic system - A division of the ANS that promotes "rest-and-digest" functions, slowing heart rate and stimulating digestion and energy conservation., Nuclei - Clusters of neuron cell bodies that serve as functional processing centers in the CNS., Ganglion - Clusters of neuron cell bodies in the PNS that relay sensory or motor information., Tracts - Bundles of nerve fibers (axons) in the CNS that transmit signals between different regions of the brain and spinal cord., Nerve - bundle of axons in the PNS that transmits sensory, motor, or mixed signals between the CNS and the body.,

Nervous system - definitions.

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