Corticomotor Function pp

Question 1

Facial expressions

Answer 1

Pyramidal & extrapyramidal contributions

Question 2

Lateral corticospinal tract sensory

Answer 2

Facilitate or suppress transmission of afferent input

Help focus attention on sensory input relevant to motor conlrol

Question 3

Lateral corticospinal tract motor

Answer 3

Mainly fine control of distal extremeties & coarse regulation of proximal flexors

Question 4

Lesions limited to the corticospinal tract

Answer 4

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Question 5

Effect on lesion of the corticospinal tract

Answer 5

Lose fine control of the digits cant perform individual movements

Question 6

Effects of lesions of primary motor corte

Answer 6

Paresis
Spasticity
In PMC hypotonia
Permanent deficit in control of fine, finger movements

Question 7

Premotor area Fx

Answer 7

Visual Guidance
Reaching & Grasping
Through 2 separate p/w’s
So uses visual field to control motor task

Question 8

Mirror neurons

Answer 8

activate whether you are doing the grasping or watching someone doing the grasping

Question 9

Premotor cortex lesions

Answer 9

Interferes w/ learning a new task involving associating a specific stimulus w/ a required movement

Question 10

Supplementary motor area

Answer 10

Planning or preparing for sequential motor acts. By remembered or self determined stimuli.
More active when done (no visual cues)

Question 11

Lesion in the SMA

Answer 11

Unilateral limits ability to perform complex task requiring both hands.
Postural & anticipatory

Question 12

Lesion to input SMA

Answer 12

(Parkinsons) difficulty have w/ self initiated activity like walking.
Initiating
Suppressing

Question 13

Frontal Eye Fields

Answer 13

Input from visual association cortex & basal nuclei & thalamic relays. About location of a visual target

Question 14

FEF & superior colliculus

Answer 14

Collaborate together to control eye movements

Question 15

FEF FX

Answer 15

Influences eye movements through projections to the vertical & horizontal gaze centers & sup. c.
Important for voluntary & memory guided eye movements

Question 16

FEF lesion

Answer 16

Deficit in ability to make saccades that are not guided by an external target
Cant direct their eye away from stimulus in their visual field

Question 17

LMN Disorder

Answer 17

Muscle atropy
Decreased tone
Weak/absent reflex
Fasiculations
Fibrillations
Possible paralysis
Flaccid

Question 18

UMN Disorders

Answer 18

Spasticity
Overactive DTR
Spastic paralysis or spastic paresis
Immediate (flaccid)

Question 19

Quadriplegia

Answer 19

High cervical transections

Question 20

Paraplegia

Answer 20

Below the cervical level but above lumbar cord

Question 21

Brainstem lesion

Answer 21

Crossed paralysis

Question 22

Alternating Hemiplegia

Answer 22

LMN CN seen on one side of head & UMN signs contralateral
CROSSED PALSY

Question 23

Lesions of the Internal Capsule

Answer 23

Corticonuclear fibers at GENU of internal capsule
Corticospinal fibers at posterior limb IC
Stroke lenticulostriate arteries can produce motor signs contralateral