Cortical Control of movement Flashcards

1
Q

what is the homunculi

A

the homunculi show the areas most densely packed with sensory receptors - shows how much cortical space each body part takes up

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2
Q

why is surgical motor mapping important

A

when removing a tumor the surgeon must avoid removing brain tissue that is essential for movement

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3
Q

name the 3 main cortical motor regions

A

Primary motor cortex, non-primary motor cortex, supplementary motor cortex (SMA)

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4
Q

what is the function of the primary motor cortex

A

they fire around 5 to 100ms before movement onset and can code for the basic parameters of movement.

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5
Q

what is the function of the non primary motor cortex

A

codes for complex aspects of movement such as the pre-motor complex, plans movement, spatial guidance and sensory guidance of movement

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6
Q

what is the function of the supplementary motor cortex (SMA)

A

other complex aspects of movement such as coordinating sequences of actions, biannual coordination.

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7
Q

what other areas are associated with movement

A

Primary sensory complex, posterior parietal complex, corticospinal tract

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8
Q

what is the function of the primary sensory complex

A

touch, vibration, heat, pain, and pressure. Kinesthesia - the ability to recognise joint movement and sensation of resistance.

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9
Q

what is the function of the posterior parietal cortex

A

integration of sensory, visual information to execute complex movement in the environement. command apparatus for operation of the limbs, hands, and eyes.

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10
Q

what is the function of the corticospinal tract?

A

the most important tract in humans for precise control of the limbs. increasing complexity up the brain.
spinal cord - simple reflexes
medulla - complex reflexes
basal ganglia - programmed movements
cortex - complex conscious movements

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