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chapter 11 part 2
vocab: nervous system
21
Science
11th Grade
02/11/2010

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Term
Nissl bodies
Definition
chromatophilic substance; stains darkly with basic dyes
Term
neurofibrils
Definition
bundles of intermediate filaments; important in maintaining cell shape and integrity; seen throughout cell body
Term
processes
Definition
extend from the cell body of all neurons
Term
dendrites
Definition
branching neuron process that serves as a receptive, input, or region; transmits the nerve impulse toward the cell body
Term
axon
Definition
neuron process that carries impulses away from the nerve cell body; efferent process; the conducting portion of a nerve cell
Term
axon hillock
Definition
cone-shaped area of the cell body
Term
nerve fiber
Definition
axon of a neuron
Term
terminal branches
Definition
end branches of the axon
Term
myelin sheath
Definition
fatty insulating sheath that surrounds all but the smallest nerve fibers
Term
myelinated fibers
Definition
conduct nerve impulses rapidly
Term
unmyelinated fibers
Definition
axons lacking a myelin sheath and therefore conducting impulses quite slowly
Term
neurilemma
Definition
portion of Schwann cell that includes the exposed part of its plasma membrane
Term
nodes of Ranvier
Definition
gaps in the sheath of Schwann cells
Term
white matter
Definition
white substance of the central nervous system; myelinated nerve fibers
Term
gray matter
Definition
gray area of the central nervous system; contains cell bodies and unmyelinated fibers of neurons
Term
multipolar neurons
Definition
neurons with three or more processes; most common neuron type in the central nervous system
Term
bipolar neurons
Definition
neuron with axon and dendrite that extend from opposite sides of the cell body
Term
unipolar neurons
Definition
neuron in which embryological fusion of the two processes leaves only one process extending from the cell body
Term
sensory (afferent) neurons
Definition
transmit impulses from sensory receptors in the skin of internal organs toward or into the central nervous system
Term
motor (efferent) neurons
Definition
carry impulses aaway from the central nervous system to the effector organs (muscles & glands) of the body periphery
Term
interneuron (association) neurons
Definition
lie between motor and sensory neurons in neural pathways and shuttle signals through the central nervous system pathways where integration occurs
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