Parkinson Disease
Also written as PD.
The substantia nigra, located in the midbrain, is essential for movement control and is involved in Parkinson's disease.
PARKINSON DISEASE (PD)
- Most common hypokinetic movement disorder
- Core lesion: Loss of dopaminergic neurons from substantia nigra → reduced striatal dopamine
- Tremor (resting, "pill-rolling")
- Masked facies · stooped posture · festinating gait
- Diagnosis confirmed by symptomatic response to L-DOPA
Read this in Neurodegenerative Prion Diseases: CJD, Pathology & Rapid Dementia
What our notes say
- The substantia nigra, located in the midbrain, is essential for movement control and is involved in Parkinson's disease. (MEDICAL PHYSIOLOGY II ESsays)
- Parkinson's disease is a neurodegenerative disorder characterized by the loss of dopamine-producing neurons in the substantia nigra of the brain. (MEDICAL PHYSIOLOGY II ESsays)
- Pathophysiology in Parkinson's Disease:Degeneration of Dopaminergic Neurons: In Parkinson’s disease, there is progressive loss of dopaminergic neurons in the substantia nigra, leading to a dopamine deficiency in the striatum. (Medical Physiology Pp2 Year 2)
- It is different from Parkinson’s disease because it is genetically inherited and primarily caused by a mutation in the Huntingtin (HTT) gene. (Polymerase Chain Reaction (PCR))
- Thus, features similar to Parkinson disease can be present. (CNS PATHOLOGY — Past Paper Questions & Answers)
- | Stooped, reduced arm-swing, festinant (difficulty starting/stopping) | Parkinson's disease | (CNS History Taking & Neurological Exam Guide | Clinical Skills)
Study material on Parkinson Disease
- CNS PATHOLOGY
- Medical Physiology Pp2 Year 2
- CNS History Taking & Neurological Exam Guide | Clinical Skills
- END YEAR PP1 & PP2 2025 Physiology: MCQs for Medical School Exams
- Medical Physiology II (Paper 2)
- Weekly Pathology Exam - July 24, 2026 (Section A: MCQs)
- Weekly Pathology Exam - July 17, 2026 (Section A: MCQs)
- Weekly Pathology Exam - July 10, 2026 (Section A: MCQs)
Practice questions on Parkinson Disease
A wide variety of neurotransmitters have been identified in the cell bodies and afferent synaptic terminals in the basal ganglia. A deficiency of which of the following transmitters is typically associated with Parkinson disease?
- Norepinephrine
- Dopamine
- Serotonin
- GABA
- Substance P
Answer: B. Parkinson's disease is characterized by degeneration of dopaminergic neurons in the substantia nigra, leading to dopamine deficiency in the striatum. This dopamine deficiency is responsible for the motor symptoms of Parkinson's disease. Treatment often involves dopamine replacement therapy. ---
What neurotransmitter is associated with Parkinson's disease?
- Norepinephrine
- Serotonin
- Dopamine
- Endorphins
- GABA
Answer: C. Parkinson's disease is characterized by the death of dopamine-producing neurons in the substantia nigra. This leads to decreased dopamine levels, causing the characteristic motor symptoms like tremors, rigidity, and bradykinesia (slowness of movement). --- ---
Which neurotransmitter deficiency is strongly associated with Parkinson's disease?
- Acetylcholine
- Serotonin
- Dopamine
- Norepinephrine
Answer: C. Parkinson's disease is characterized by the progressive degeneration of dopaminergic neurons in the substantia nigra, leading to a profound deficiency of dopamine in the basal ganglia.
What neurotransmitter is associated with Parkinson's disease?
- Serotonin
- Dopamine
- Acetylcholine
- Norepinephrine
Answer: B. Parkinson's disease is characterized by the progressive loss of dopaminergic neurons in the substantia nigra, leading to a deficiency in dopamine. This deficiency results in the motor symptoms of the disease.
Which neurotransmitter deficiency is strongly associated with Parkinson's disease?
- Serotonin
- Dopamine
- Acetylcholine
- Norepinephrine
Answer: B. Parkinson's disease is characterized by the progressive loss of dopaminergic neurons in the substantia nigra, leading to a deficiency in dopamine. This deficiency results in the motor symptoms of the disease.
What neurotransmitter is associated with Parkinson's disease?
- Serotonin
- Dopamine
- Acetylcholine
- Norepinephrine
Answer: B. Parkinson's disease is characterized by the degeneration of dopaminergic neurons in the substantia nigra, leading to a deficiency in dopamine. This results in motor symptoms such as tremors, rigidity, and bradykinesia.