Chapter 10: Vocabulary Flashcards

1
Q

acetylcholine

A

neurotransmitter chemical released at the ends of nerve cells

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2
Q

afferent nerve

A

carries messages toward the brain and spinal cord (sensory nerve).

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3
Q

arachnoid membrane

A

middle layer of the three membranes that surround the brain and spinal cord.

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4
Q

astrocyte

A

type of glial cell that transports water and salts from capillaries

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5
Q

autonomic nervous system

A

nerves that control involuntary body functions of muscles, glands, and internal organs

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6
Q

axon

A

microscopic fiber that carries the nervous impulse along a nerve cell

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7
Q

blood-brain barrier

A

protective separation between the blood and brain cells. this makes it difficult for substances to penetrate capillary walls and enter the brain

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8
Q

brainstem

A

posterior portion of the brain that connects the cerebrum with the spinal cord; includes the pons and medulla oblongata

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9
Q

cauda equina

A

collection of spinal nerves below the end of the spinal cord

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10
Q

cell body

A

part of a nerve cell that contains the nucleus

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11
Q

central nervous system

A

the brain and the spinal cord

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12
Q

cerebellum

A

posterior part of the brain that coordinates muscle movements and maintains balance

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13
Q

cerebral cortex

A

outer region of the cerebrum, containing sheets of nerve cells; gray matter of the brain

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14
Q

cerebrospinal fluid

A

circulates throughout the brain and spinal cord

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15
Q

cerebrum

A

largest part of the brain; responsible for voluntary muscular activity, vision, speech, taste, hearing, thought, and memory

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16
Q

cranial nerves

A

twelve pairs of nerves that carry messages to and from the brain with regard to the head and neck

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17
Q

dendrite

A

microscopic branching fiber of a nerve cell that is the first part to receive the nervous impulse

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18
Q

dura mater

A

thick, outermost layer of the meninges surrounding and protecting the brain and spinal cord

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19
Q

efferent nerve

A

carries messages away from the brain and spinal cord; motor nerve

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20
Q

ependymal cell

A

glial cell that lines membranes within the brain and spinal cord and helps form cerebrospinal fluid

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21
Q

ganglion

plural: ganglia

A

collection of nerve cell bodies in the peripheral nervous system

22
Q

glial cell

neuroglial cell

A

supportive and connective nerve cell that does not carry nervous impulses
astrocytes, microglial cells, ependymal cell, oligodendrocytes
can reproduce themselves as opposed to neurons

23
Q

gyrus

plural: gyri

A

sheet of nerve cells that produces a rounded ridge on the surface of the cerebral cortex; convolution

24
Q

hypothalamus

A

portion of the brain beneath the thalamus; controls sleep, appetite, body temperature, and secretions from the pituitary gland

25
medulla oblongata
part of the brain just above the spinal cord; controls breathing, heartbeat, and the size of blood vessels; nerve fibers cross over here
26
meninges
three protective membranes that surround the brain and spinal cord
27
microglial cell
phagocytic glial cell that removes waste products from the central nervous system
28
motor nerve
caries messages away from the brain and spinal cord to muscles and organs; efferent nerve
29
myelin sheath
covering of white fatty tissue that surrounds and insulates the axon of a nerve cell. myelin speeds impulse conduction along axons
30
nerve
macroscopic cord-like collection of fibers that carry electrical impulses
31
neuron
nerve cell that carries impulses throughout the body; parenchyma of the nervous system
32
neurotransmitter
chemical messenger released at the end of a nerve cell. it stimulates or inhibits another cell which can be a nerve cell, muscle cell or gland cell neurotransmitters are acetylcholine, norepinephrine, dopamine, serotonin
33
oligodendroglial cell | oligodendrocyte
glial cell that forms the myelin sheath covering axons.
34
parasympathetic nerves
involuntary, automatic nerves that regulate normal body functions such as heart rate, breathing, and muscles of the gastrointestinal tract
35
parenchyma
essential, distinguishing tissue of any organ or system
36
peripheral nervous system
nerves outside the brain and spinal cord: cranial, spinal, and autonomic nerves
37
pia mater
thin, delicate inner membrane of the meninges
38
plexus | plural: plexuses
large, interlacing netword of nerves. | lumbosacral, cervical, and brachial
39
pons
part of the brain anterior to the cerebrum and between the medulla and the rest of the midbrain
40
receptor
organ that receives a nervous stimulus and passes it on to afferent nerves skin, ears, eyes, and taste buds are receptors
41
sciatic nerve
nerve extending from the base of the spine down the thigh, lower leg, and foot. Sciatica is pain or inflammation along the course of the nerve
42
sensory nerve
carries messages toward the brain and spinal cord from a receptor; afferent nerve
43
spinal nerves
Thirty-one pairs of nerves arising from the spinal cord
44
stimulus | plural: stimuli
agent of change (light, sound, touch) in the internal or external environment that evokes a response
45
stroma
connective and supporting tissue of an organ. glial cells are the stromal tissue of the brain
46
sulcus | plural: sulci
depression or groove in the surface of the cerebral cortex; fissure
47
sympathetic nerves
autonomic nerves that influence bodily functions involuntarily in times of stress
48
synapse
space through which a nervous impulse travels between nerve cells or between nerve and muscle or glandular cells
49
thalamus
main relay center of the brain.
50
vagus nerve
tenth cranial nerve
51
ventricles of the brain
canals in the brain that contain cerebrospinal fluid