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Physiology II Exam 1 > Motor Fxn I: Part One > Flashcards

Motor Fxn I: Part One Flashcards

1
Q

Stretch reflex Characteristics

A
  • Stretch stretches Group Ia Afferent
  • Ia synapse on AMN of SAME Muscle
  • Muscle Contracts to decrease tension on Spindle
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2
Q

Types of intrafusal fibers

A
  • Nuclear BAG

- Nuclear CHAIN

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3
Q

Golgi tendon organ

A
  • Group Ib Afferents
  • Arranges in SERIES w/ EF fiber
  • Detect Tension
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4
Q

Lower motor neurons are classified into what categories?

A
  • Alpha
  • Beta
  • Gamma
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5
Q

Nuclear bag fibers

  • Detection
  • Innervation
  • Nuclei
A
  • Detect Change in LENGTH
  • Ia and dynamic Gamma efferent
  • Mult. Located in the Bag
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6
Q

Gamma motor neurons do what?

A

Keep Muscle SPINDLE Taught

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7
Q

Characteristics of Interneurons

A
  • Bipolar shape
  • Capable of Spontaneous activity
  • Responsible for most of SPINAL cord integrative fxn
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8
Q

Motor Nerve Cells deal with what kind of movement?

A

Voluntary movement

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9
Q

Fxn of Renshaw cells

A
  • Receive branches from AMN
  • Transmit Inhibitory signals to surrounding MN
    (Lateral Inhibition)
  • Enhance FLUIDITY of limb movement
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10
Q

The Afferent neurons are ____.

A

Sensory

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11
Q

Muscle Spindle Fxn

A
  • Dynamic Stretch Reflex
  • Static Reflex
  • Damping (Prevents Jerking)
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12
Q

Bran Areas that control Gamma Fibers

A
  • Bulboreticular Region of Brain Stem
  • Cerebellum
  • Basal Nuclei
  • Cerebral cortex
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13
Q

Excitatory Interneurons

A
  • Spinal Reflex
    (Step on a Tack)
  • Ipsilateral and Contralateral signals
  • Can cut the head off of a chicken and it can still move*
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14
Q

Result of Stretch reflex

A

Synergistic Muscles are Activated and Antagonistic muscles are inhibited

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15
Q

Nuclear Chain fibers

  • Detection
  • Innervation
  • Nuclei
A
  • STATIC Change
  • Group II and static gamma
  • More numerous than NBF
  • Nuclei located in a chain
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16
Q

Efferent Neurons are _____.

A

Motor

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17
Q

What NT do RENSHAW cells use?

A

Glycine

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18
Q

NT for Alpha and Gamma MN

A

Both use ACh

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19
Q

Golgi tendon Organ

  • Orientation to EFF
  • Stimulation
  • Detection
  • Overall fxn
A
  • Arranges in Series w/ EF Fibers
  • Stimulated by Contraction or Stretch
  • Detects Tension
  • Deals with RELAXATION of muscles to heavy load
20
Q

The Babinski reflex is seen in ____.

A

Infants

21
Q

1 AMN can innervate how many muscle fibers?

A

3000+

22
Q

What are the types of Motor Neurons in the Spinal Cord?

A
  • Alpha

- Gamma

23
Q

Lesion effects on REFLEXES: UMN vs LMN

A

UMN:
- Increased

LMN:
- Absent

24
Q

Major Volitional Movement go through what Tract in the Spinal Cord?

A

Cortico-Spinal Tract

  • UMN
25
Q

Pacinian Corpuscles

A
  • Group II

- Detect VIBRATIONS

26
Q

Lower Motor neurons go from ______ to ______.

A
  • Spinal cord

- Effector (Sk. Muscle)

27
Q

T/F: INTERNEURONS are 30x more Numerous as Ant. Motor Neurons

A

True

28
Q

Motor Neuron pool

A

AMN that innervate a MUSCLE

29
Q

Does the muscle spindle fxn as a motor or sensory receptor?

A

Sensory

30
Q

Excitatory IN use _____ and Inhibitory IN use ______.

A
  • GABA

- Glutamate

31
Q

Ib Inhibitory Neurons

A
  • AUTOGENIC Inhibition reflex
  • GOLGI tendon activated with Stretch
  • Responsible for smooth muscle contraction
  • Protects from tears
32
Q

Free Nerve Endings

A
  • Group III and IV Afferent

- Detect Noxious stimuli

33
Q

What is the NT of the UMN to the LMN?

A

Glutamate

34
Q

Ia Inhibitory Neurons

A
  • Inhibits ANTAGONISTIC muscle

- Avoids Spasticity

35
Q

LMN terminate at Effector and use what NT

A

ACh

36
Q

Large Motor neurons

  • Muscle innervation
  • Threshold
  • Firing time
  • Force
A
  • Many
  • High
  • Fire LAST
  • LARGE
37
Q

Small Motor neurons

  • Muscle innervation
  • Threshold
  • Firing time
  • Force
A
  • Innervate Few muscle fibers
  • LOW threshold
  • Fire FIRST
  • Small force
38
Q

Golgi Tendon Reflex is _____ to Stretch Reflex

A

Opposite

39
Q

Motor Unit Consists of what?

A
  • A SINGLE Motor Neuron

- The muscle FIBERS it Innervates

40
Q

Where are the cell bodies of Motor neurons located?

A

3 places:

  1. Motor Cortex
  2. Brain Stem
  3. Spinal Cord
41
Q

What are the INTERNEURONS in the Spinal Cord called?

A

RENSHAW Cells

42
Q

Muscle Spindle

A
  • Group Ia and II Afferents
  • Arranges in PARALLEL w/ EF fiber
  • Direct both Dynamic and STATIC changes is muscle length
43
Q

Ia Inhibitory Neurons receive signals from what?

A

Muscle SPINDLE

44
Q

Lesion effects on Muscle Tone: UMN vs LMN

A

UMN:
- Spastic

LMN:
- Flaccid

45
Q

In the Spinal Cord, the Sensory fibers are ____ and the Motor Neurons are ____.

A
  • Lateral

- Medial

46
Q

Are Cranial Nerve UMN or LMN?

A

LMN

Physiology II Exam 1 (10 decks)

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