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References: Movement: Muscles, Reflexes, and Motor Control

  1. Parkinson's Disease - National Institute of Neurological Disorders and Stroke (NINDS) - The government's plain-language guide to Parkinson's symptoms, causes, diagnosis, and treatments, including carbidopa-levodopa and deep brain stimulation. It is the main source for this chapter's Bedside case and a good place to check facts.
  2. Parkinson's Disease: Causes, Symptoms, and Treatments - National Institute on Aging (NIA) - A short, readable overview that explains early, easy-to-miss signs like small handwriting, a soft voice, and loss of smell. Helpful for seeing Parkinson's as more than a tremor.
  3. Deep Brain Stimulation (DBS) for the Treatment of Parkinson's Disease and Other Movement Disorders - NINDS - Explains where DBS electrodes go (STN, GPi, and thalamus), when the FDA approved each use, and how basic research on basal ganglia circuits led to the therapy. Shows how circuit diagrams turn into treatments.
  4. 10.1 The Physiological Actions Implementing Movement: Contraction of Muscles - OpenStax, Introduction to Behavioral Neuroscience (CC BY-NC-SA 4.0) - A free textbook section on how actin, myosin, calcium, and ATP produce contraction, with clear figures of the sarcomere and motor units. Good next step after Sections 7.2 and 7.3.
  5. 10.2 Eliciting Contractions from Lower Levels: Lower Motoneurons and Reflex Arcs - OpenStax, Introduction to Behavioral Neuroscience - Covers lower motor neurons, the size principle, muscle spindles, and the knee-jerk reflex, using a soccer-kick example. Matches Sections 7.3 and 7.4.
  6. 10.3 Our Brain Gets Involved: Responsibilities of Upper Motor Systems - OpenStax, Introduction to Behavioral Neuroscience - Explains the motor cortex, corticospinal tracts, the direct and indirect basal ganglia pathways, the cerebellum's error correction, and motor learning. The best single free reading for Sections 7.5 to 7.9.
  7. Basal ganglia - Wikipedia - A detailed overview of basal ganglia anatomy, the direct, indirect, and hyperdirect pathways, and how dopamine acts on D1 and D2 neurons. Useful for checking the signs in this chapter's circuit table; verify details against primary sources.
  8. Assessment of heterogeneity among participants in the Parkinson's Progression Markers Initiative cohort using α-synuclein seed amplification: a cross-sectional study - Siderowf et al., Lancet Neurology (2023) - The large study behind this chapter's "What's new" section, reporting how well the spinal-fluid alpha-synuclein test separated people with Parkinson's from healthy controls. A challenging but real example of biomarker research.
  9. FDA Encourages Use of Parkinson's Biomarker for Future Clinical Trials - Michael J. Fox Foundation (September 2024) - Explains the FDA's 2024 Letter of Support for the alpha-synuclein seed amplification assay in research and trials. A good lesson in the difference between regulatory "support" and "approval."
  10. The Nobel Prize in Physiology or Medicine 2000: Press Release - NobelPrize.org - Describes how Arvid Carlsson linked dopamine to movement and L-dopa to Parkinson's treatment, and how Eric Kandel used the Aplysia gill-withdrawal reflex to study learning. Connects this chapter to Ply's story.