TB9 BB Lecture 2; How do we control a movement?

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  • Created by: mint75
  • Created on: 02-05-16 14:56

1. What is the stretch reflex?

  • Gravity acts on a muscle. Receptors output to spinal cord to say muscle has been stretched. Loop back to muscle, gravity effects counteracted.
  • Gravity acts on a muscle. Receptors output to brainstem to say muscle has been stretched. Loop back to muscle, gravity effects counteracted.
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2. The subthalamic nucleus and globus pallidus/substantia nigra share?

  • Excitatory connections
  • Both excitatory and inhibitory connections
  • Inhibitory connections

3. What connection type does glutamate facilitate?

  • Excitatory connections
  • Inhibitory connections
  • Modulatory connections

4. In terms of basal ganglia damage, which of these causes Huntingtons?

  • Degeneration of striatum. No inhibition of thalamus, resulting in overexcitability and unwanted movements
  • Lack of dopamine increases activity of direct pathway. Tonic inhibition of thalamus and less excitation of cortex. Difficulties starting and stopping movements
  • Unilateral damage to subthalamic nuclei. Unwanted movements

5. The globus pallidus/substantia nigra and caudate and putamen share?

  • Inhibitory connections
  • Excitatory connections
  • Both excitatory and inhibitory connections

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