20 Somatosensory & Motor Systems

Question 1

I, Slide 10: What is another name for the somatotopic map?

Answer 1

Homunculus

Question 2

II, Slide 6: What is the cell membrane of a striated muscle fiber cell called?

Answer 2

Sarcolemma

Question 3

III, Slide 2: Which tract belongs to the lateral pathway?

A. Tectospinal Tract
B. Vestibulospinal Tract
C. Medullary Reticulospinal Tract
D. Rubrospinal Tract

Answer 3

D. Rubrospinal Tract

Question 4

III, Slide 2: What are the 2 pathways of the descending spinal tract? (Pick 2)

A. Lateral Pathway
B. Contralateral Pathway
C. Ventromedial Pathway
D. Ventrolateral Pathway

Answer 4

A. Lateral Pathway

C. Ventromedial Pathway

Question 5

III, Slide 2: True/False - The ventromedial pathway consists of 4 tracts and the lateral pathway consists of only 1 tract.

Answer 5

False - lateral pathway consists of 2 tracts

Question 6

III, Slide 3: True/False - Mammals have both corticospinal and rubrospinal tracts.

Answer 6

TRUE

Question 7

III, Slide 5: True/False – The reticulospinal tract mediates autonomic functions and inhibits voluntary movement.

Answer 7

TRUE

Question 8

I, slide 14: T/F - We have two responses from pain: (1) quick, sharp pain from slow C fibers and (2) dull, sustained pain from fast, myelinated alpha delta axons.

Answer 8

False: quick pain from fast, myelinated alpha delta axons & dull pain from slow C fibers

Question 9

II, slide 10: Alpha motor neurons are influenced by: A. proprioception from muscles spindles B. gamma motor neuron C. golgi tendon organs D. spinal interneurons E. all of the above

Answer 9

E. All of the above

Question 10

III, slide 10: The motor symptoms of Parkinson’s disease result from death of this doapamine-generating component of the basal ganglia. A. substantia nigra B. globus pallidus C. caudate D. putamen

Answer 10

A. Substantia Nigra

Question 11

III, slide 9: T/F - The basal ganglia are important for timing sequence of motor movement.

Answer 11

True

Question 12

III, slide 7 & 8: T/F - Movement in the cortex and superior colliculus is controlled by local coding.

Answer 12

False - Population Coding

Question 13

III, slide 9: The substania nigra is the source of which modulatory neurotransmitter? A. glutamate B. glycine C. acetylcholine D. dopamine

Answer 13

D. Dopamine

Question 14

III, slide 12: Many learned behaviors have been mapped back to which brain structure? A. motor cortex B. thalamus C. cerebellum D. brainstem

Answer 14

C. Cerebellum

Question 15

T/F - Somatotopic mapping does not change according to experience

Answer 15

False

Question 16

T/F - The skin of the spinal cord is called Dermatome, and it function is to supply the spinal nerves…

Answer 16

True

Question 17

T/F - Referring to somatotopic mapping, the size is proportional with the density of sensory input..

Answer 17

True

Question 18

How many spinal nerves are located in the Thoracic region?

1. 12
2. 14
3. 15
4. 0

Answer 18

12

Question 19

T/F- Primary afferent axons conduct at different speeds

Answer 19

True

Question 20

According to receptive field size and adaptation, which options match with Pacinian corpuscle?

1. Large and Slow
2. Large and Fast
3. Small and Slow
4. Small and Fast

Answer 20

2. Large & Fast

Question 21

How well does this type of mechanoreceptor adapt: Meissners corpuscle?

1. Slow
2. Fast
3. Can’t Adapt

Answer 21

2. Fast

Question 22

T/F - Sensory receptors adapt slowly only.

Answer 22

False

Question 23

What is the second inner layer of the skin called?

1. Epidermis
2. Dermis
3. Hypodermis
4. Connective tissue

Answer 23

2. Dermis

Question 24

T/F - Mechanoreceptors are not sensitive to physical distortion.

Answer 24

False

Question 25

Where do signals for the Decending Spinal Tract start?

Answer 25

Motor Cortex

Question 26

If the muscle is flexing how is the tension measured?

Answer 26

Through the Golgi Tendon Organ

Question 27

What do muscle spindles do?

Answer 27

They monitor the length of the muscle and pass on the information to the nervous system.

Question 28

What happens to muscle progenitor cells with age?

Answer 28

They stop renewing halting muscle fiber generation and growth.

Question 29

How does Ca2+ cause muscle contraction?

Answer 29

It alters troponin on actin so the myosin head can grab on.

Question 30

Muscle contractions are all or nothing or graded?

Answer 30

Graded

Question 31

Lower motor circuits go through dorsal or ventral root of the spinal cord?

Answer 31

Ventral

Question 32

How do thermoreceptos work?

Answer 32

By altering firing frequency ; rapid firing is "on"

Question 33

Where do ascending pain pathways end at?

Answer 33

Primary somatosensory cortex

Question 34

Ascending pain pathways go through dorsal or ventral root of the spinal cord?

Answer 34

Dorsal