Motor Systems l Flashcards
What function does the motor system have?
Functions to move the body
What are the parts of the motor system? (6)
- Motor Cortex
–Spinal Cord
–Brainstem
–Motor Nerves (CN &
spinal)
–Basal Ganglia
–Cerebellum
What is the function of the posterior motor cortex?
Provides sensory information to the frontal cortex
What is the function of the prefrontal cortex?
Plans movements
What is the function of the premotor cortex?
Organize movement sequences
What is the function of the motor cortex?
Produces specific movements
What is the order of the motor signal on the cortex? (4)
How many homunculi do the primary motor and premotor cortices contain?
10 homunculi
What do the disproportionate sizes of the homunculi represent?
The complexity of movements that they can perform
Larger are in the homunculi = greater ____________
motor control
Which parts of the homunculi are especially large?
Hand and Face
What would happen if we would electrically stimulate a certain area in the motor cortex?
It would elicit movements of body parts corresponding to the map of the body
Is the motor system responsible for:
a) Control of individual muscles
b) Specialized control of muscle combinations (movement)
c) Information processing of our sensory information
b) Specialized control of muscle combinations (movement)
Different homunculi represent different classes of ____________ specified by ____________, __________________ and ___________.
movement
body part
movement location
function
Different homunculi represent different classes of ____________ specified by ____________, __________________ and ___________.
movement
body part
movement location
function
What are the two main motor pathways?
Direct Pathway
Indirect Pathway
What is another name for the direct pathways in motor systems?
Pyramid Pathway
What is another name for the indirect pathways in motor systems?
Extrapyramidal Pathway
Where do Pyramidal neurons (upper motor neurons) originate from?
Motor cortex
Upper motor neurons are part of which nervous system?
CNS