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    Paralysis of a muscle or group of muscles


Inability to move parts of the body.

Tissue made up of bundles of long, slender cells that contract when stimulated.



PET scan
Positron emission tomography scan. A diagnostic test that uses a sophisticated camera and computer to produce images of how your body is functioning. PET scans show the difference between healthy and abnormally functioning tissues.

Prostate specific antigen. A protein which comes from the prostate gland. The PSA test, which measures the levels of prostate specific antigen in the blood, is one test for prostate cancer.

A male sex gland that produces a thick fluid which forms part of semen.

A surgical procedure in which a part of the brain called the globus pallidus is lesioned in order to improve symptoms of tremor, rigidity, and bradykinesia.

The name given to a group of disorders with similar features; four primary symptoms (tremor, rigidity, postural instability, and bradykinesia) that are the result of the loss of dopamine-producing brain cells.


Wavelike contractions that move food through the digestive tract.

Pyramidal pathway
A collection of nerve tracts that travel from the cerebral cortex through the pyramid of the medulla oblongata in the brainstem to the spinal cord. Within the pyramid of the medulla, fibers cross from one side of the brain to the opposite side of the spinal cord; the pyramidal pathway is intact in Parkinson's disease.

Hard and soft tissue forming the roof of the mouth.

Palliative treatment
Non invasive relief of irritating conditions.

A partial loss of sensation; may be temporary or permanent.

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