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olfactory
carries impulses for the sense of smell
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optic
carries impulses for vision
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oculomotor
supplies motor fibers four of the six muscles that direct the eyeball, to the eyelid
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trochlear
supplies motor fibers for one external eye muscle
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Trigeminal
conducts sensory impulses from the skin of the face and mucosa of the nose and mouth
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Abducens
supplies motor fibers to the lateral rectus muscle, which rolls the eye laterally
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Facial
activates muscles of facial expression and the lacrimal and salivary glands
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Vestibulocochlear
vestibular branch transmits impulses for the sense of balance. cochlear branch transmits impulses for the sense of hearing
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Glossopharyngeal
supplies motor fibers to the pharynx (throat) that promote swallowing and saliva production
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Vagus
fibers carry sensory impulses to the pharynx, larynx, and the abdominal and thoracic viscera
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Accessory
mostly motor fibers that activate the sternocleidomastoid and trapezius muscles
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Hypoglossal
motor fibers control tongue movements
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Neuroglia
acts to support neurons
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Astrocytes
help control the chemical environment in the brain by picking up excess ions and recapturing released neurotransmitters. Forms a living barrier between capillaries and neurons
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Microglia
spider like phagocytes that dispose of debris, including dead brain cells and bacteria
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Ependymal Cells
help circulate the cerbrospinal fluid that fills those cavities and forms a protective cushion around the CNS
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Oligodendrocytes
wrap around nerve fibers, which produces fatty insulating coverings and myelin sheath
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Afferent (Sensory) Neurons
transmit impulses form PNS to CNS
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Efferent (Motor) Neurons
transmit impulses from CNS to muscles or glands
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Interneurons (association neurons)
located within CNS and conducts impulses between sensory and motor neurons
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