Sensorimotor System

Question 1

Where are Betz Cells found?

Answer 1

in the primary motor cortex

Question 2

what are Betz cells?

Answer 2

large pyramidal neurons

Question 3

What is isometric contraction?

Answer 3

activation of a muscle can increase tension it exerts onto bones without shortening or pulling them

Question 4

what is sterognosis?

Answer 4

the process of identifying objects by touch

Question 5

what causes monkeys to have difficulty letting go of their food?

Answer 5

dorsolateral cortocispinal tracts being transected

Question 6

All motor neurons that innervate the fibres of a single muscle are called its

Answer 6

motor pool

Question 7

biceps and triceps are

Answer 7

antagonistic

Question 8

What information about the muscle do muscle spindles provide the CNS with?

Answer 8

Length

Question 9

What helps to distribute the work between different motor neurons of a muscle’s motor pool?

Answer 9

recurrent collateral inhibition

Question 10

What is dynamic contraction?

Answer 10

activation of a muscles with shortening or pulling

Question 11

What is motor output guided by?

Answer 11

sensory input and feedback

Question 12

What is the order of the hierarchy in the sensorimotor system?

Answer 12

association cortex; posterior parietal association cortex; dorsolateral prefrontal association cortex.

Question 13

What does the posterior parietal association cortex do?

Answer 13

integrate info from where the body is and where the object is

Question 14

What does the dorsal prefrontal association cortex do?

Answer 14

receives from posterior and sends to secondary motor.

Question 15

How many areas does the secondary motor cortex have?

Answer 15

8 (2 premotor, 3 supplementary and 3 cingulate)

Question 16

What does the secondary motor cortex do?

Answer 16

programing of patterns of movements

Question 17

What does the Cerebellum do?

Answer 17

receives information from the primary and secondary motor cortex. and is involved with learning sequences and motor learning

Question 18

Where is the primary motor cortex located?

Answer 18

the frontal lobe

Question 19

What is the primary motor cortex’s job?

Answer 19

initiates movements, produces simple movement

Question 20

What does the basal ganglia do?

Answer 20

motor outputs and modulatory functions

Question 21

what is in the dorsolateral corticospinal and dorsolateral coritcorubrospinal tracts?

Answer 21

medullary pyramids and betz cells

Question 22

what is in the ventromedial corticospinal tract and ventromedial corticobrainstem-spinal tract?

Answer 22

the tectum receives auditory and visual information about spatial information.