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NSU Psych 101

NSU Chapter 3

TermDefinition
nervous system The body's electrochemical communication circuitry, made up of billions of neurons.
central nervous system (CNS) The brain and the spinal cord.
peripheral nervous system (PNS) The network of nerves that connects the brain and spinal cord to other parts of the body. It is divided into the somatic nervous system and the autonomic nervous system.
somatic nervous system The division of the PNS consisting of sensory nerves, whose function is to convey information to the CNS and motor nerves, whose function is to transmit information to the muscles.
autonomic nervous system The division of the peripheral nervous system that communicates with the body's internal organs. It consists of the sympathetic and parasympathetic nervous systems.
sympathetic nervous system The division of the autonomic nervous system that arouses the body.
parasympathetic nervous system The division of the autonomic nervous system that calms the body.
neurons Nerve cells that are specialized for processing information. Neurons are the basic units of the nervous system.
cell body The part of the neuron that contains the necleus, which directs the manufacture of substances that the neuron needs for growth and maintenance.
dendrites Branches of a neuron that recieve and orient information toward the cell body; most neurons have numerous dendrites.
axon The part of the neuron that carries information away from the cell body to other cells.
myelin sheath The layer of fat cells that encases and insulates most axons. The myelin sheath speeds up the transmission of nerve impulses.
synapses Tiny junctions between two neurons, generally where the axon of one neuron meets the dendrites or cell body of another neuron.
brain stem The region of the brain that includes most of the hindbrain (excluding the cerebellum) and the midbrain).
occipital lobe The part of the cerebral cortex at the back of the head that is involved in vision.
temporal lobe The portion of the cerebral cortex just above the ears that is involved in hearing, language processing and memory.
frontal lobe The part of the cerebral cortex just behind the forehead that is involved in the control of voluntary muscles, intelligence and personality
pariental lobe Area of the cerebral corex at the top of the head that is involved in registering spatial location, attention and motor control
Created by: Sadiqah on 2008-08-17



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