Medical Definition of TONUS. 1. : tone 2a. 2. : a state of partial contraction that is characteristic of normal muscle, is maintained at least in part by a continuous bombardment of motor impulses originating reflexly, and serves to maintain body postureâcalled also muscle tone; compare clonus.
Neuralgia is the definitive term for nerve pain. Words ending in -algia indicate pain. A closely related word is neuropathy. It indicates an injury, disease, deterioration, defect or other abnormality of the nerve, which usually produces pain, pos...
Parsonage-Turner Syndrome. Parsonage-Turner Syndrome, also known as brachial neuritis or neuralgic amyotrophy, is a peripheral nerve disorder that causes severe pain â usually involving the shoulder and arm. This pain is followed in days to weeks by weakness.