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Physiology > Section 3 > Flashcards

Section 3 Flashcards

1
Q

Axon classification method differentiates fiber’s conduction velocity; used for both motor and sensory axons

A

Electrophysiological classification

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2
Q

Axon classification method classifies axons by diameter and myelination; applies only to sensory axons

A

Roman numeral classification

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3
Q

What types of axons are class A?

A

Motor and sensory

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4
Q

What types of axons are class B?

A

Motor only

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5
Q

What types of axons are class C?

A

Motor and sensory

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6
Q

What type of axons are preganglionic axons in the ANS? Postganglionic?

A

Type B; Type C

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7
Q

What 2 factors affect impulse conduction velocity?

A
  1. Axon diameter: larger = faster conduction velocity

2. Myelin coated

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8
Q

Electrical stimulation causes action potentials to move through each axon in the nerve trunk; the signal recorded from the nerve trunk is the sum of all the individual APs from each nerve axon and is named the _____________.

A

Compound action potential

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9
Q

If some nerve(s) in the autonomic trunk are pathological, you will see an (increase/decrease) in compound action potential.

A

Decrease

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10
Q

Conduct action potentials toward the spinal cord and brain

A

Sensory neurons

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11
Q

Conduct action potentials away from the spinal cord to the skeletal muscle or smooth muscle

A

Motor neurons

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12
Q

Types A and B fibers have (myelinated/unmyelinated) axons whereas type C fibers has (myelinated/unmyelinated) axons.

A

Myelinated; unmyelinated

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13
Q

Axon types A and B fibers conduct APs at (faster/slower) velocities than type C fibers

A

Faster

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14
Q

Roman numeral sensory fiber group classification and speed that corresponds with type A alpha.

A

I, 120 m/s

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15
Q

Roman numeral sensory fiber group classification and speed that corresponds with type A beta.

A

II, 70 m/s

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16
Q

Roman numeral sensory fiber group classification and speed that corresponds with type A delta.

A

III, 15 m/s

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17
Q

Roman numeral sensory fiber group classification and speed that corresponds with type C.

A

IV, 2 m/s

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18
Q

Axons of A alpha motor axons innervate ______, and velocity is ___ m/s.

A

Extrafusal (fast twitch skeletal m. fibers); 120

19
Q

Axons of A alpha Ia sensory axons innervate ______, and velocity is ___ m/s.

A

Muscle spindles (primary affarent m. spindle fiber); 120

20
Q

Axons of A alpha Ib sensory axons innervate ______, and velocity is ___ m/s.

A

Golgi tendon organs and pressure receptors; 120

21
Q

Axons of A beta motor axons innervate ______, and velocity is ___ m/s.

A

Estrafusal (slow twitch m. fibers); 70

22
Q

Axons of A beta II sensory axons innervate ______, and velocity is ___ m/s.

A

Muscle spindles (secondary affarent m. spindle fiber); 70

23
Q

Axons of A gamma motor axons innervate ______, and velocity is ___ m/s.

A

Intrafusal m. fibers of muscle spindle; 40

24
Q

Axons of A delta III sensory axons innervate ______, and velocity is ___ m/s.

A

Receptors of pain, touch, pressure, temperature (fast pain); 15

25
Q

Axons of B motor axons innervate ______, and velocity is ___ m/s.

A

Preganglionic autonomic; 14

26
Q

Axons of C motor axons innervate ______, and velocity is ___ m/s.

A

Postganglionic anutonomic; 2

27
Q

Axons of C IV sensory axons innervate ______, and velocity is ___ m/s.

A

Receptors of pain and temperature (slow pain); 2

28
Q

In relation to the length of muscle spindle fibers, what do type I nerve axons sense?

A

Rate of change of length in m. fiber

29
Q

In relation to the length of muscle spindle fibers, what do type II nerve axons sense?

A

Length of m. fiber (if it’s short or long)

30
Q

Increased impulse frequency in Ia fibers results in ______________.

A

Increased m. force

31
Q

Increased impulse frequency in Ib fibers results in _____________.

A

Decreased m. force

32
Q

Class II afferent axons innervates the _____ or secondary endings of the muscle spindle receptor and pressure receptors

A

Flower spray

33
Q

Class III afferent axons innervate ______ (fast pain), _____ (course) receptors, and ______ (mostly cold).

A

Nociceptors; touch; thermoreceptors

34
Q

Class IV afferent axons innervate ______ (slow pain), _______ receptors, and ______ (cold and warm)

A

Nociceptors; itch and tickle; thermoreceptors

35
Q

Largest axons have (lowest/highest) threshold to slowly rising electrical stimulus

36
Q

AP reaching recording electrode first traveling in the ______ axon, followed by APs traveling in the _______ diameter axons.

A

Largest; smaller

37
Q

Cutaneous (touch) mechanoreceptors are ______ adapting, whereas musculoskeletal mechanoreceptors are _______ adapting

A

Slow; fast

38
Q

A alpha diameter

39
Q

A beta diameter

40
Q

A gamma diameter

41
Q

A delta diameter

42
Q

B diameter

43
Q

C diameter

Physiology (15 decks)

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