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astrocyte

star-shaped neuroglial cell between neurons and blood vessels

axon

nerve fiber arising from a slight elevation of the cell body that conducts an impulse away from the cell body

collateral

branch of an axon

dendrite

neuron process with many tiny. thornlike spines that conducts an impulse toward the cell body

myelin

substance of schwann cell composed of lipoprotein that insulates axons and increases impulse speed

neurilemma

sheath of schwann cell containing cytoplasm and nucleus that encloses myelin

neurofibrils

network of fine threads of actin within cell body

nissl bodies (chromatophilic substance)

corresponds to rough endoplasmic reticulum in other cells

effector

structure capable of responding to motor impulse

ependymal cell

cells that cover the inside spaces of the brain ventricles and secrete CSF

ganglion

specialized mass of neuron cell bodies outside the brain or spinal cord

interneuron (association neuron)

transmits impulse from sensory to motor neuron within central nervous system

microglia

phagocytic neuroglial cell

motor (efferent) neuron

transmits impulse out of the brain or spinal cord to effectors (muscles and glands)

oligodendrocyte

myelin-forming neuroglial cell in brain and spinal cord

sensory (afferent) neuron

transmits impulse into brain or spinal cord from receptors

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