Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

MED210 > Lecture25: The Motor Unit, Muscle Tone > Flashcards

Lecture25: The Motor Unit, Muscle Tone Flashcards

1
Q

What is the function of LMN?

A

The innervation of striated muscles of body and head

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the function of UMN?

A

They don’t innervate the muscles directly,

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Where do sensory neurons enter the spinal cord?

A

From the Dorsal Horn

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Where do sensory neurons exit the spinal cord?

A

The ventral horn

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What do Dorsal and Ventral roots merge to form?

A

Spinal nerves

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How long is the spinal cord?

A

46cm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What are both ends of the spinal cord?

A

The Foramen magnum to the L2 vertebrae

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the narrow caudal end of the spinal cord called?

A

Conus medullaris

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What are the horse-like things in the sacral region called?

A

Cauda equina

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is the definition of reflexes?

A

The simplest motor response to sensory input, the neural pathways involved are called reflex arcs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is an example of monosynaptic reflexes?

A

The Withdrawal reflex

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the definition of the Monosynaptic reflex?

A

Only one synapse in the reflex arc

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the definition of the Polysynaptic reflex?

A

More than 2 synapses involved in the reflex

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Are built-in unlearned responses classified as Simple-Basic?

A

Yes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Give an example of Acquired or conditioned reflexes

A

Going silent when the lights dim in a cinema

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the function of crossed extensor reflexes?

A

The maintenance of balance

17
Q

What is reciprocal inhibition?

A

The relaxation of the muscle opposite to the one involved in the reflex, seeing as they work in antagonistic pairs

18
Q

What is Muscle Tone?

A

It’s that all muscles are under some degree of stretch to ensure proper posture

19
Q

What are both reflexes that maintain the muscle tone and posture?

A

The stretch and myotatic reflexes

20
Q

What defects cause a change in the muscle tone?

A

LMN damage or descending pathway damage

21
Q

What are Motor Pools?

A

The motor neurons that innervate the same muscle

22
Q

What are the 2 Types of LMN found in the same pool?

A

Both alpha and Y(gamma) motor neurones

23
Q

What muscles do the Alpha motor neurons innervate?

A

The ones needed for balance and posture (extrafusal muscles)

24
Q

What muscles do the Y(gamma) motor neurons innervate?

A

The extrafusal ones

25
Q

What is a Motor unit?

A

The smallest functional component of the motor system

26
Q

What does a motor unit consist of?

A

A motor neuron and all the muscle fibres it innervates

27
Q

What is the function of a motor unit?

A

The precision of muscle control and how fast it’s activated

28
Q

What are both types of motor units?

A

Small and large motor units

MED210 (20 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions