motor control

Question 1

brodmann area 4

Answer 1

primary motor cortex

located in precentral gyrus

Question 2

DISEASE: Gille’s de la Tourette’s syndrome

Answer 2

basal ganglia prevented from inhibiting muscles

twitching

Question 3

what does the basal ganglia consist of?

Answer 3

• caudate nucleus
• putamen
• substantia nigra
• subthalamic nuclei

Question 4

DEFINE: proprioception

Answer 4

knowing orientation of limbs in space without visual information

Question 5

what are the types of afferents in muscle fibres?

Answer 5

type Ia afferents

type II afferents

Question 6

what is the effect of adding 5HT to γ motor neuron?

Answer 6

1. γ motor neuron fires more rapidly
2. intrafusal fibres stiffer
3. transmits more information to sensory cortex (any little movement will be transmitted to other side)

Question 7

what is the effect of adding NA to γ motor neuron?

Answer 7

1. γ motor neuron firing rate decreases
2. intrafusal fibres more elastic - more tension
3. transmits less information to sensory cortex