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Neurology SOH > Somatomotor System > Flashcards

Somatomotor System Flashcards

1
Q

Where are UMN located?

A

Within the brain and spinal cord

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2
Q

Function of UMN

A

To initiate or modulate a voluntary movement

- sends signal to LMN whether to start or stop contracting

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3
Q

Where are a large proportion of LMN cell bodies located?

A

Ventral horn of spinal cord

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4
Q

What is the function of LMN ?

A

Messenger to muscle to tell it to contract

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5
Q

LMNs innervating flexors are distal/medial to those supplying extensors ?

A

Flexors - distal

Extensors - proximal

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6
Q

What forms the final point of communication to initiate a muscle contraction?

A

LMN

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7
Q

Name 2 types of LMN

A

Alpha MN

Gamma MN

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8
Q

Alpha MN/Gamma MN innervates the bulk of skeletal muscle fibres that generate force.

A

Alpha MN

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9
Q

Alpha MN/Gamma MN - innervates a sensory organ within the muscle.

A

Gamma MN

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10
Q

Axons of LMNs exit the spinal cord in the dorsal/ventral roots?

A

Ventral

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11
Q

Motor neurones are distributed equally within the spinal cord. True or false?

A

False

- greater number in the cervical and lumbar enlargement as these are supplying the limbs

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12
Q

Muscle contraction results from the individual and combined actions of ____ ?

A

Motor units

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13
Q

Small motor units are for fine movements. True or false? q

A

True

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14
Q

Type 1 motor unit fibres

A

Slow oxidating

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15
Q

Type IIa motor unit fibres

A

Fast

- ATP derived from oxidative phosphorylation

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16
Q

Type IIb motor unit fibres

A

Fast

- ATP derived from glycolysis

17
Q

Fast fatiguing motor units are which type?

A

Type IIb

18
Q

Fatigue resistant motor units are which type?

A

Type IIa

19
Q

Slow motor units are which type

A

Type I

20
Q

The myotatic reflex is a monosynaptic reflex arc. True of false?

A

True

21
Q

The knee jerk is underpinned by which type of reflex?

A

Myotatic

22
Q

Name 2 types of intrafusal muscle fibres

A

Nuclear bag fibres
- bag 1 and 2
Chain fibres

23
Q

what are Intrafusal muscle fibres innervated by?

A

Gamma-MNs

24
Q

Where are golgi tendon organs located?

A

At the junction of muscle and tendon

25
Q

Function of golgi tendon organs ?

A

Monitor changes in muscle tension

26
Q

Where are proprioceptive axons located?

A

In connective tissue of joints

27
Q

Function of proprioceptive axons?

A

Respond to changes in angle, direction and velocity of movement of a joint.

28
Q

What are the function of Renshaw cells?

A

Stop motor neurones from firing

29
Q

Interneurones can be excitatory or inhibitory. True or false?

A

True

Neurology SOH (31 decks)

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