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Contains the brain and spinal cord.
Central Nervous System
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Contains cranial and spinal nerves and their ganglia.
Peripheral Nervous System
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Covers the brain and spinal cord.
Cerebral meninges, dura, arachnoid and pia maters.
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The brain and spinal cord are suspended in this.
Cerebrospinal fluid (CSF)
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Transmit electrical signals. Found in grey matter of CNS and ganglia.
Neurons
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Nonexcitable, surround and wrap neurons.
Neuroglial cells (support cells)
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Neuroglia in the CNS
Astrocytes, microglia, ependymal cells, and oligodendrocytes.
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Neuroglia in the PNS
Satellite cells and Schwann cells
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Most abundant glial cell type. They take up and release ions to control the environment around neurons. They recapture and recycle neurotransmitters.
Astrocytes
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Smallest and least abundant neuroglia.
Microglia
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Line the central cavity of the spinal cord and brain.
Ependymal cells
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Produce myelin sheaths in CNS.
Oligodendrocytes
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Surround neuron cell bodies within ganglia.
Satellite cells
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Surrond axons in the PNS and forms myelin sheath around axons in the PNS.
Schwann cells
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The site at which neurons communicate.
Synapses
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Depolarizes the postsynaptic membrane.
Excitatory synapses
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Reduces the ability of the postsynaptic neuron to generate an action potential.
Inhibitory synapses
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Layer of delicate connective tissues surrounding the axon.
Endoneurium
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Groups of axons bound into bundles.
Nerve fascicles
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Connective tissue surrounding a nerve fasicle.
Perineurium
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The whole nerve surrounded by this tough fibrous sheath.
Epineurium
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Picked up by sensor receptors and carried by nerve fibers of PNS to the CNS.
Sensory (afferent) signal
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Carried away from the CNS and innervates muscles and glands.
Motor (efferent) signals
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Touch, pain, pressure, vibration, temperature, and proprioception in skin, body wall, and limbs. Specializes in hearing, equilibrium, vision, and smell.
Somatic sensory (afferent)
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Stretch, pain, temperature, chemical changes, and irritation in viscera; nausea and hunger. Specializes in taste.
Visceral sensory (afferent)
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Motor innervation of all skeletal muscles (except pharyngeal arch muscles)
Somatic motor (efferent)
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Motor innervation of pharyngeal arch muscles
Branchial motor (efferent)
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Motor innervation of smooth muscle, cardiac muscle, and glands; equivalent to autonomic nervous system (ANS)
Visceral motor (efferent)
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Site where stimulus acts.
Receptor
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Transmits afferent impulses to the CNS
Sensory neuron
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Consists of one or more synapses in the CNS
Integration center
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Conducts efferent impulses from integration center to an effector.
Motor neuron
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A muscle or gland cell that responds to efferent impulses by contracting or secreting.
Effector
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The simplest and fastest of all reflexes that consists of only one synapse.
Monosynaptic reflex
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The more common type of reflex where most have a single interneuron between the sensory and motor neuron.
Polysynaptic reflex
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Functions in automatic behaviors necessary for survival, is a passageway for all fiber tracts running between the cerebrum and the spinal cord, and is heavily involved with the innervation of the face and head.
Brain stem
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Smoothes and coordinates body movements and helps maintain equilibrium.
Cerebellum
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Enables humans to be aware of ourselves and our sensations, initiates and controls voluntary movements, communicates, remembers, and understands.
Cerebral cortex
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Cooperates with the cerebral cortex in controlling movements and receives input from many different cortical areas.
Basal nuclei
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Is situated lateral to the thalamus, is divided by a band of nerve fibers called the internal capsule into the caudate nucleus and the lentiform nucleus.
Corpus striatum
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Is composed of the Globus pallidus and Putamen.
Lentiform nucleus
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Connects the third verticle with the lateral ventricles.
Interventricular foramen of Monro
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Connects the third and fourth ventricles.
Cerebral aqueduct of Sylvius
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