Lab 27: nervous tissue and nerves

collateral

branch of an axon

ependymal cell

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

nissl bodies (chromatophilic substance)

corresponds to rough endoplasmic reticulum in other cells

oligodendrocyte

myelin-forming neuroglial cell in brain and spinal cord

axon

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

neurofibrils

network of fine threads of actin within cell body

dendrite

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

microglia

phagocytic neuroglial cell

neurilemma

sheath of schwann cell containing cytoplasm and nucleus that encloses myelin

ganglion

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

astrocyte

star-shaped neuroglial cell between neurons and blood vessels

effector

structure capable of responding to motor impulse

myelin

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

interneuron (association neuron)

transmits impulse from sensory to motor neuron within central nervous system

sensory (afferent) neuron

transmits impulse into brain or spinal cord from receptors

motor (efferent) neuron

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