Nervous system 2

Question 1

What is the motor homunculus?

Answer 1

Size of cortical surface responsible for part of the body is proportional to the degree of motor control needed for that part

Question 2

Hierachy of motor cortices

Answer 2

1. Prefrontal: Planning, initiating
2. Secondary motor/pre-motor
3. Primary motor

1 and 2 stores memory and learns.

Question 3

Lesion to upper motor pathways?

Answer 3

Paresis or spastic paralysis. Hypertonia: Increased tone, as only neurons and spinal cord involved

Question 4

Lesion to lower motor pathways?

Answer 4

Flaccid paralysis. Hypotonia: Weak muscle, lost of outflow despite wanting to initiate movement, no contraction.

Question 5

Apraxia meaning

Answer 5

As if movement never been learned despite muscle working fine (probs damage to prefrontal or secondary motor systems)