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Physiology NEU 205 > Motor 1: Monosynaptic (stretch) reflex > Flashcards

Motor 1: Monosynaptic (stretch) reflex Flashcards

1
Q

Nucleur Bag fiber is responsible for detection of

A

Dynamic stretch

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2
Q

Nuclear chain fiber is responsbile for detection of

A

Static stretch

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3
Q

Type of Afferent fiber of Nuclear bag Intrafusal Muscle fiber

A

Primary ending (annulospiral)
* Group Ia
* Thick
* myelinated

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4
Q

Type of Afferent fiber of Nuclear chain Intrafusal Muscle fiber

A

Both Primary ending & secondary ending

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5
Q

Dynamic response is done by

A

primary ending (annulospiral) fibers of Nuclear Bag

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6
Q

Dyanmic response is the base of

A

Tendon jerk (sudden contraction & relaxation)

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7
Q

Static Response is done by

A

Primary ending (annulospiral) & secondary ending of Nuclear Chain

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8
Q

Static response is the base of

A

Muscle tone

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9
Q

primary ending (annulospiral) responds to

A

both change in length & change in rate of stretch

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10
Q

Enumerate physiological Importances of Stretch reflex

A
  1. Maintain muscle length
  2. Control of Voluntary movement
  3. Base of Muscle tone & tendon jerk
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11
Q

Describe Servo-assistant function of the voluntary control of movement done by stretch reflex

A
  1. Descending fibers from cortex stimulate both Alpha and gamma motor neurone
  2. Alpha neurone causes contraction of extrafusal Muscle fibers, while Gamma motor neurone causes contraction of peripheral contractile part of Intrafusal Muscle fibers, causing intrafusal Fibers to stretch
  3. Stretch in infrafusal fibers Causes afferent (primary and secondary Ending) to stimulate Alpha neurone more, causing more contraction
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12
Q

Describe Damping function of the voluntary control of movement done by stretch reflex

A
  • Impulses ariving from the cortex cause ausculatory jerky contractions
  • Afferent fiber (primary and sencondary ending) sends signals to the cortex to readjust and smoothen the contraction
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13
Q

Despite rest, explain why muscle spindle is always stretched

A
  • Attachement of the muscle further than its actual length
  • Gravity
  • Activity of Gamma motor Neurone
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14
Q

Explain why muscle tone doesnt cause fatigue

A
  • Alternating contractions
  • Sub-tetanic
  • Red fibers
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15
Q

Functions of Muscle tone

A
  1. Maintain body temperature
  2. Aid in venous return
  3. Maintain posture
  4. Background for voluntary movement
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16
Q

Facilitatory reticular formation sends facilitatory signals to Gamma motor Neurone through

A

Ventral reticulospinal Tract

17
Q

Facilitatory reticular formation Recieves facilitatory signals from

A
  • primary motor Area
  • Neocerebellum

+ intrisic activity

18
Q

Facilitatory reticular formation is located in the

A

Pons

19
Q

Vestibular Nucleus sends facilitatory signals to gamma motor neurone through

A

Vestibulospinal tract

20
Q

Site of Inhibitory reticular formation

A

Medulla

21
Q

Inhibitory reticular formations sends Inhibtory signals to gamma motor neurone through

A

Lateral reticulospinal tract

22
Q

Inhibitory reticular formations recieves signals from

A
  • Paleocerebellum
  • Cortical Suppressor Area
  • Basal Ganglia
23
Q

Red nucleus sends inhibtory Signals to gamma motor neurone through

A

Rubrospinal Tract

24
Q

Explain what will happen to Stretch reflex if there was a cut between midbrain & pons

A
  • Facilitatory: still working, as facilitatory RF has intrinsic activity
  • Inhibitory: Not working, no intrinsic activity

Causing Decerbrate Rigidity

25
Q

Causes of Areflexia/Atonia

A
  • Tebes dorsalis
  • Polimyelitis
  • Peripheral Neuritis
26
Q

Causes of Hyperreflexia/Hyper atonia

A
  • Anxiety (high reticular formation activity)
  • UMNL
  • Hyperthyroidism
27
Q

Causes of Hyporeflexia/Hypotonia

A

(defect in facilitation):
* Neocerebellar Syndrome
* Myxoedema (opposite hyperthyroidism)
* Sleep (no reticular formation activity)

28
Q

Golgi tendon organ is stimulated by

A
  1. Active contraction
  2. Passive tension
29
Q

Receptor of Inverse stretch reflex

A

Golgi tendon organ

30
Q

Afferent of Inverse stretch reflex

A

Group I-b

31
Q

Center of inverse stretch reflex

A

Bisynaptic Center

32
Q

Efferent of inverse stretch reflex

A

Alpha motor neurone

33
Q

Response of inverse stretch reflex

A

Inhibitory (relaxation of muscle)

34
Q

Importance of inverse stretch reflex

A

to protect muscle from exessive Contraction

Physiology NEU 205 (24 decks)

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