Neurodegenerative Disease
A progressive movement disorder caused by the loss of dopamine-producing neurons in the midbrain, leading to tremor, stiffness, and slowed movement.
Parkinson's disease is a progressive movement disorder caused primarily by the loss of dopamine-producing neurons in the substantia nigra, a structure within the midbrain portion of the brain stem. Dopamine from this region is essential for smooth, well-timed voluntary movement, and its depletion produces the condition's hallmark motor symptoms: tremor, rigidity, and slowness of movement.
The core pathology centres on the substantia nigra within the brain stem's midbrain, which projects dopamine to the basal ganglia - deep structures involved in initiating and smoothing movement. Because the cerebellum works closely with these circuits to fine-tune movement and balance, gait and coordination problems in Parkinson's often involve altered cerebellar activity as well, even though the cerebellum isn't the primary site of degeneration.
Current treatment mainly aims to replace or supplement dopamine signalling, most commonly with the medication levodopa, though its effectiveness can change over years of use. Deep brain stimulation - implanting electrodes that modulate abnormal activity in movement-related circuits - has become an established option for suitable patients with advanced symptoms. Research into earlier diagnosis (including via imaging and biomarkers), and into therapies that might slow or halt neuron loss rather than only treating symptoms, is ongoing.
This article is for general education and isn't a substitute for professional medical advice or diagnosis.
Explore the regions involved in parkinson's disease in more depth:
