chapter 9 nervous system Flashcards

1
Q

The nervous system is divided into two principal divisions

A

central nervous system (CNS) and peripheral nervous system (PNS).

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2
Q

Central nervous system (CNS) include the

A

brain and spinal cord

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3
Q

peripheral nervous system (PNS) includes all

A

nerves

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4
Q

Autonomic nervous system (ANS)

A

consists of structures that regulate the body’s automatic or involuntary functions

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5
Q

Two major types of cells are found in nervous tissue:

A

neurons or nerve cells and glia, which are support cells. Neurons conduct impulses, whereas glia support neurons.

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6
Q

Dendrites:

A

Branching projections that conduct impulses to cell body of neuron

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7
Q

Axon:

A

Elongated projection that conducts impulses away from cell body of neuron.

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8
Q

Axon is surrounded by a segmented wrapping of a material called

A

myelin

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9
Q

Sensory (afferent) neurons:

A

carry impulses to the spinal cord and brain from all parts of the body. Sensory neurons are also called afferent neurons.

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10
Q

Motor (efferent) neurons:

A

Conduct impulses away from brain and spinal cord to muscles and glands. Motor neurons are also called efferent neurons.

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11
Q

interneurons:

A

Conduct impulses from sensory neurons to motor neurons or among a network of interneurons; also known as central or connecting neurons

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12
Q

Glia (neuroglia)

A

One function of glial cells is to hold the functioning neurons together and protect them.

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13
Q

Astrocytes:

A

Star-shaped cells that anchor small blood vessels to neurons

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14
Q

Microglia:

A

Small cells that move in inflamed brain tissue carrying on phagocytosis

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15
Q

Oligodendrocytes:

A

Form myelin sheaths on axons in the CNS

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16
Q

Bundles of axons in the CNS are called

A

tracts

17
Q

Endoneurium:

A

Surrounds individual fibers within a nerve

18
Q

Perineurium:

A

Surrounds a group (fascicle) of nerve fibers

19
Q

Epineurium:

A

Surrounds the entire nerve

20
Q

Definition of a nerve impulse

A

nerve impulse is a self-propagating wave of electrical disturbance that travels along the surface of a neuron’s plasma membrane.

21
Q

Nerve impulses are also called

A

action potentials

22
Q

The synapse:

A

a synapse is the place where impulsesare transmitted from one neuron, called the presynaptic neuron, to another neuron, called the postsynaptic neuron.

23
Q

Synapse is made up of three structures

A

Synaptic knob, Synaptic cleft, Plasma membrane

24
Q

Neurotransmitters

A

are chemicals by which neurons communicate.

25
Q

The brain and the spinal cord are protected by three membranes called

A

meninges.

26
Q

Consists of three parts of brain, named in ascending order

A

Medulla oblongata, Pons, Midbrain

27
Q

Cerebellum

A

Second largest part of the human brain
Helps control muscle contractions to produce coordinated movements for maintaining balance, moving smoothly, and sustaining normal postures

28
Q

Thalamus

A

Dumbbell-shaped mass of gray matter extending toward each cerebral hemisphere

29
Q

Pineal gland (pineal body)

A

Small body resembling a pine nut behind the thalamus

30
Q

Cerebrum

A

Largest and uppermost part of the brain .