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Neuron that carries information from the sensory receptors to the central nervous system.
afferent neuron
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Middle layer of meninges.
arachnoid
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A type of neuroglia that maintains nutrient and chemical levels in neurons.
astrocyte
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Part of the peripheral nervous system that carries impulses from the central nervous system to glands, smooth muscles, cardiac muscle, and various membranes.
autonomic nervous system
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Part of a nerve cell that conducts nerve impulses away from the cell body.
axon
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Large masses of gray matter within the cerebrum.
basal ganglia
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Body organ responsible for controlling the body's functions and interactions with outside stimuli.
brain
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One of the four major divisions of the brain; division that controls certain heart, lung, and visual functions.
brainstem
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Part of a nerve cell that has branches or fibers that reach out to send or receive impulses.
cell body
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The brain and spinal cord.
central nervous system (CNS)
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One of the four major divisions of the brain; division that coordinates musculoskeletal movement.
cerebellum
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Outer portion of the cerebrum.
cerebral cortex
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Watery fluid that flows throughout the brain and around the spinal cord.
cerebrospinal fluid (CSF)
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One of the four major divisions of the brain; division involved with emotions, memory, conscious thought, moral behavior, sensory interpretations, and certain bodily movement.
cerebrum
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Ability to transmit a signal.
conductivity
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Folds in the cerebral cortex; gyri.
convolutions
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Bridge of nerve fibers that connects the two hemispheres of the cerebrum.
corpus callosum
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Any of 12 pairs of nerves that carry impulses to and from the brain.
cranial nerves
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Bony structure that the brain sits in.
cranium
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A thin branching extension of a nerve cell that conducts nerve impulses toward the cell body.
dendrite
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One of the four major structures of the brain; it is the deep portion of the brain and contains the thalamus.
diencephalon
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Outermost layer of meninges.
dura mater
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Neuron that carries information to the muscles and glands from the central nervous system.
efferent (motor) neuron
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Area between the pia mater and the bones of the spinal cord.
epidural space
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One of the parts of the diencephalon; serves as a sensory relay station.
epithalamus
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Ability to respond to stimuli.
excitability
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One of many indentations of the cerebrum; sulcus.
fissure
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One of the four parts of each hemisphere of the cerebrum.
frontal lobe
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Also convolution
gyrus (pl. gyri)
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One of the parts of the diencephalon; serves as a sensory relay station.
hypothalamus
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Neuron that carries and processes sensory information.
interneuron
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Part of the brain stem that regulates heart and lung functions, swallowing, vomiting, coughing, and sneezing.
medulla oblongota
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Three layers of membranes that cover and protect the brain and spinal cord.
meninges (sing., meninx)
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A type of neuroglia that removes debris.
microglia
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Part of the brainstem involved with visual reflexes.
midbrain
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Fatty tissue that covers axons.
myelin sheath
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Bundle of neurons that bear electrical messages to the organs and muscles of the body.
nerve
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Basic cell of the nervous system having three parts: cell body, dendrite, and axon; neuron.
nerve cell
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Released energy that is received or transmitted by tissue or organs and that usually provokes a response.
nerve impulse
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Membranous covering that protects the myelin sheath.
neurilemma
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Cell of the nervous system that does not transmit impulses.
neuroglia, neuroglial cell
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Basic cell of the nervous system having three parts; nerve cell.
neuron
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Various substances located in tiny sacs at the end of the axon.
neurotransmitters
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One of the four parts of each hemisphere of the cerebrum.
occipital lobe
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A type of neuroglia that produces myelin and helps to support neurons.
oligodendroglia
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Part of the autonomis nervous system that operates when the body in in a normal state.
parasympathetic nervous system
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One of the four parts of each hemisphere of the cerebrum.
parietal lobe
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Innermost layer of meninges.
pia mater
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Part of the brainstem that controls certain respiratory functions.
pons
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Tissue or organ that receives nerve impulses.
receptor
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Part of the peripheral nervous system that receives and processes sensory input from various parts of the body.
somatic nervous system
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Ropelike tissue that sits inside the vertebral column and from which spinal nerves extend.
spinal cord
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Any of 31 pairs of nerves that carry messages to and from the spinal cord and the torso and extremities.
spinal nerves
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Anything that arouses a response.
stimulus (pl. stimuli)
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Area between the dura mater and the pia mater across which the arachnoid runs.
subdural space
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Also fissure.
sulcus (pl. sulci)
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Part of the autonomic nervous system that operates when the body in under stress.
sympathetic nervous system
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Space over which nerve impulses jump from one neuron to another.
synapse
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One of the four parts of each hemisphere of the cerebrum.
temporal lobe
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Group of fibers at the end of an axon that passes the impulses leaving the neuron to the next neuron.
terminal end fibers
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One of the four parts of the diencephalon; serves as a sensory relay station.
thalamus
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One of the four parts of the diencephalon; serves as a sensory relay station.
ventral thalamus
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Cavity in the brain for cerebrospinal fluid.
ventricle
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cerebr(o), cerebri
cerebrum
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mening(o), meningi(o)
meninges
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myel(o)
bone marrow, spinal cord
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Reflex on the plantar surface of the foot.
Babinski's reflex
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X-ray of the brain's blood vessels after a dye is injected.
cerebral angiogram
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Radiographic imaging that produces cross-sectional images.
computerized (axial) tomography (CT or CAT) scan
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Record of the electrical impulses of the brain.
electroencephalogram (EEG)
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Record of the radiographic study of the ventricles of the brain.
encephalogram
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