Motor Cortices

Question 1

What does the Primary Motor Cortex receive inputs from?

Answer 1

Somatosensory cortex (major), Posterior parietal cortex (major) ,
Basal ganglia, and
Cerebellum

Question 2

What does the SMA receive inputs from?

Answer 2

Basal Ganglia
Cerebellum
Posterior parietal cortex
PFC

Question 3

What does the PMC receive inputs from?

Answer 3

Posterior parietal cortex
PFC
Basal ganglia
cerebellum

Question 4

What is the descending layer of the Motor Cortex?

Answer 4

Betz cells

Question 5

Stimulation of the medial aspects of the primary motor cortex affects?

Answer 5

Leg movement

Question 6

Stimulation of the lateral aspects of the medial cortex affects?

Answer 6

Torso, arm, hand and lower face movement

Question 7

Where is the internal capsule located?

Answer 7

between the thalamus and the basal ganglia

Question 8

What is located at the posterior limb of the internal capsule?

Answer 8

The arm, trunk, and limb (lower?)

Question 9

What is located at the genu of the internal capsule?

Answer 9

face

Question 10

UMN affect the spinal cord contralaterally/unilaterally/ bilaterally?

Answer 10

contra

Question 11

UMN affect the brainstem contralaterally/unilaterally/ bilaterally?

Answer 11

bilaterally

Question 12

What are the descending brainstem pathways?

Answer 12

Corticorubral (rubrospinal)
Corticotectal (tectospinal)
Corticoreticular (reticulospinal)

Question 13

What is the M1 function?

Answer 13

Movement force
Direction selectivity
Distance of movement
Movement speed

Question 14

What is the function of the PMC?

Answer 14

Selection of appropriate motor plans for voluntary movements in response to an EXTERNAL CUE

Question 15

What will a lesion in the PMC look like?

Answer 15

slowing of anticipated movement, but doesn’t lead to paralysis

Question 16

What is the function of the SMA?

Answer 16

selection of movements based on remembered sequences of movements INTERNALLY

Question 17

What will a lesion in the SMA look like?

Answer 17

Inability to perform complex movements

Question 18

What makes up the association cortex?

Answer 18

The posterior parietal cortex and the PFC

Question 19

What is the function of the posterior parietal cortex?

Answer 19

involved in making movements accurately and the processing of spatial relationships

Question 20

What will a lesion in the posterior parietal cortex look like?

Answer 20

Apraxia

Question 21

Where are “mirror neurons” located?

Answer 21

PMC

Question 22

Where are “motor-set” neurons located?

Answer 22

PMC