Lecture nine: control of movement Flashcards

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1
Q

what are Extrafusal Muscle fiber?

A

<2muscles attached to the bones by tendons, for movement”

Activated by alpha motor neurons

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2
Q

Intrafusal muscle fibers

A

set makes muscle spindle
Wrapped by afferent fibers (sensory endings)
But also: activated by gamma motor neurons
For detection of muscle length
For detection of muscle length

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3
Q

Golgi tendon organ

A

for detection of change in muscle tension

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4
Q

Pacinian corpuscles and free nerve endings

A

for detection compression of muscle (during contraction) and waste products

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5
Q

What does Myofibrils consist of?

A

Myofibrils in extrafusal fibers consist of Actin and Myosin

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6
Q

mechanism of muscle contraction

A
  1. Myosin (yellow) binds actin (pink).
  2. Myosin heads fall over and slide forward along the actin.
  3. Myosin heads release
  4. Rest condition
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7
Q

What is the Monosynaptic stretch-reflex?

A
  1. weight falls on hand
    2.detection
    muscle extension
  2. reflexive muscle contraction
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8
Q

What is the Polysynaptic inhibitory-reflex?

A

Inhibition α neuron by Golgi tendon organ
prevents excessive tension on muscle

Lift more by sedating Golgi tendon organs

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9
Q

Explain the function of monosynaptic stretch

reflexes

A

Monosynaptic stretch responses function to control limb
movements when weight is applied or removed quickly
and to maintain upright posture.

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10
Q

Contrast the structures and function of

polysynaptic reflexes with monosynaptic reflexes:

A

Monosynaptic reflexes include a single synapse involved
in simple reflexes like the patellar reflex. Polysynaptic
reflexes involve multiple synapses involved in more
complex reflexive behavior, such as inhibiting a
withdrawal reflex. Polysynaptic reflexes contain at least
one interneuron between the sensory neuron and the
motor neuron.

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11
Q

Corticospinal paths
Lateral group:
for independent limb movements:

(very importat sh$t)

A

Rubrospinal tract (via red nucleus)
lower arms, hands (not fingers)
lower legs, feet (not toes)

Corticobulbar tract
neck, face, eyes, tongue

Lateral corticospinal tract
arms, hands, fingers
legs, feet, toes

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12
Q

Rubrospinal tract

A

Rubrospinal tract (via red nucleus)
lower arms, hands (not fingers)
lower legs, feet (not toes)

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13
Q

Corticobulbar tract

A

neck, face, eyes, tongue

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14
Q

Lateral corticospinal tract

A

Lateral corticospinal tract
arms, hands, fingers
legs, feet, toes

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15
Q

What is the Ventromedial group for:

A
for balance (body posture) and walking
and controlled via nuclei in brainstem
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16
Q

Ventral corticospinal tract

A

Body posture: trunk and upper legs

17
Q

tectospinal tract

A

Orientation: trunk and head/eye movements

18
Q

vestibulospinal tract

A

Body posture: trunk and legs

19
Q

reticulospinal tract (1: lateral PRF)

A

Walking: bending legs

20
Q

reticulospinal tract (2: medial MRF

A

Walking: stretching legs

21
Q

reticulospinal tracts for autonomic functions:

A

: muscle tension, breathing, coughing, sneezing

22
Q

The lateral group consists

of the

A

the corticospinal tract, the corticobulbar tract, and the
rubrospinal tract. This system is primarily involved in control
of independent limb movements, particularly movements of
the hands and fingers.

23
Q

The Cerebellum 

A

motor coordination

24
Q

Cerebellum: damage

lateral system

A

problems with timing (agonist-antagonist) muscles results in tremor in particular at the endpoint of movements

25
Q

What is the SMA

A

SMA: Supplemantary Motor Cortex
SMA: in particular for planning movement sequences
Neuron specifically active during “pull-push” sequence
(not during “push”, “pull”, “turn” only, or during other sequences such as: “Push-Pull”)

26
Q

PMC

A

Premotor Cortex: planning movements

27
Q

Damage to parietal lobe leads to

A

Apraxia (no action)

inability to carry out complex actions
without pareses

28
Q

What are the symptoms of 1: Limb apraxia after damage to left parietal lobe

A

Use wrong body parts
Correct body parts but incorrect movement
Wrong sequence of movements

Especially during:
Imitating actions
Demonstrating actions with tools

29
Q

Constructional apraxia

A

Constructional apraxia after damage to right parietal lobe

Problems with copying figures
Problems with building larger objects from smaller elements
In fact more a visual problem: difficulty with combining the individual elements to recognize a whole object

30
Q

Explanation left-right difference:

A

Left parietal: representation own body (limb apraxia)

Right parietal: representation outside world (constructional apraxia)

31
Q

Basal Ganglia:

A

motor gating

32
Q

parts of the basal Ganglia

A
  1. Caudate nucleus
  2. Globus pallidus
  3. Putamen
33
Q

where do informations for caudate nucleus and putamen come from»?

A

Caudate en Putamen: input from primary motor and somatosensory cortex and substantia nigra

34
Q

where do informations from globus pallidus go?

A

output to motor nuclei brainstem and primary motor and premotor cortex and SMA (via thalamus)