Parkinson's Trivia 5 — Questions and Answers
Question 1: Which structure in the brain stem, when damaged, produces the blue-black discoloration visible to the naked eye in Parkinson's autopsies?
- Red nucleus
- Substantia nigra (Correct answer)
- Locus coeruleus
- Raphe nuclei
Correct answer: Substantia nigra
The substantia nigra (Latin for 'black substance') loses its dark pigment as dopaminergic neurons die, which is visible at autopsy in Parkinson's patients.
Question 2: What is the approximate percentage of dopamine neurons that must be lost before Parkinson's motor symptoms typically appear?
- 20%
- 40%
- 60–80% (Correct answer)
- 90–100%
Correct answer: 60–80%
Motor symptoms of Parkinson's typically do not appear until approximately 60–80% of dopaminergic neurons in the substantia nigra have been lost.
Question 3: Which type of exercise has been specifically studied and shown to potentially slow Parkinson's disease progression?
- Yoga only
- Swimming only
- High-intensity aerobic exercise (Correct answer)
- Resistance training only
Correct answer: High-intensity aerobic exercise
High-intensity aerobic exercise has shown the most evidence in clinical trials for potentially neuroprotective effects and slowing Parkinson's progression.
Question 4: What is 'hypomimia' in the context of Parkinson's disease?
- Reduced arm swing while walking
- Decreased facial expression (masked face) (Correct answer)
- Soft or monotone speech
- Stooped posture
Correct answer: Decreased facial expression (masked face)
Hypomimia, or 'masked face,' refers to the reduced facial expressiveness caused by Parkinson's affecting the muscles controlling facial movement.
Question 5: Which organization designates April 11 as World Parkinson's Day, chosen because it is the birthday of James Parkinson?
- World Health Organization
- European Parkinson's Disease Association (Correct answer)
- Michael J. Fox Foundation
- Parkinson's Foundation
Correct answer: European Parkinson's Disease Association
The European Parkinson's Disease Association (EPDA) established April 11 as World Parkinson's Day in 1997, honoring James Parkinson's birth date.
Question 6: What is the 'shuffling gait' characteristic of Parkinson's disease?
- High-stepping walk caused by foot drop
- Short, dragging footsteps with reduced foot clearance (Correct answer)
- Wide-based unstable walking pattern
- Asymmetric limping due to muscle weakness
Correct answer: Short, dragging footsteps with reduced foot clearance
Shuffling gait in Parkinson's is characterized by short steps with feet barely leaving the ground, often accompanied by forward-stooped posture and reduced arm swing.
Question 7: Which Parkinson's medication class works by inhibiting the enzyme that breaks down dopamine in the brain?
- Dopamine agonists
- Anticholinergics
- MAO-B inhibitors (Correct answer)
- NMDA antagonists
Correct answer: MAO-B inhibitors
MAO-B (monoamine oxidase type B) inhibitors like selegiline and rasagiline block the enzyme that degrades dopamine, increasing its availability in the brain.
Parkinson's Trivia 5
Which structure in the brain stem, when damaged, produces the blue-black discoloration visible to the naked eye in Parkinson's autopsies?