Lecture 09 - Motor Cortex Flashcards Preview

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Flashcards in Lecture 09 - Motor Cortex Deck (11):
1

Motor Cortex

Association motor cortex creates motor plan
-parietal association cortex, BG, cerebellum help

primary motor cortex executes plan via corticospinal and corticobulbar tract

frontal eye fields do horizontal gaze somehow

2

Association motor cortex

supplementary motor cortex (SMA)
Premotor cortex (PMA)

3

Frontal eye field

always lateral frontal cortex, but varied from individual to individual

4

The motor plan

Which muscles, sequence, intensity, duration
-Association motor cortices send motor plan to primary motor cortex for execution
-need parietal association cortex for sensation and vision

5

praxis

ability to do learned purposeful movements
motor plan

6

Corticobulbar tracts

to face/neck
Lateral primary --> corona radiata --> genu of internal capsule --> bilateral to most cranial nerve nuclei with LMN, but variable

speech and swallow need both sides
lower face (CONTRA) and eyes are exceptions

7

Corticospinal tracts

everywhere except face/neck
Primary --> corona radiata --> post. limb of internal capsule --> cerebral peduncle of midbrain --> basis pontis --> medullary pyramind --> pyramidal decussation --> lateral corticospinal tract

8

Apraxia

Inability to perform learned purposeful movements, despite having necessary motivation and basic motor and sensory functions
-deficit in motor planning, doesn't always involve weakness
-association motor and/or parietal association cortices

9

Paresis

weakness
hemi - unilateral
para - bilateral
quadri - all four limbs
di - all four limbs that is worse in legs than arms
mono - one limb
opthalmo - any eye movement
gaze - both eyes

10

plegia/paralysis

absence of volitional movement

11

palsy

paresis OR plegia