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The group includes lumbago, stiff-neck, and pleurodynia conditions which have this in common, that sudden and severe pain is excited by movement of the affected part. It would appear to involve mainly the fibrous tissue of muscles, although it may extend from this to aponeuroses, ligaments, periosteum, and the sheaths of nerves. The term fibrositis was applied to it by Gowers in 1904.
A similar condition may implicate the fascia lata of the thigh, or the calf muscles and their aponeuroses crural fibrositis. In painful stiff-neck, or "rheumatic torticollis," the pain is located in one side of the neck, and is excited by some inadvertent movement. The head is held stiffly on one side as in wry-neck, the patient contracting the sterno-mastoid.
Sometimes the tendon runs down the middle of a muscle, and the fibers run obliquely into it, the tendon resembling the quill in a feather. Again, tendons are spread out in a flat layer on the surface of muscles, in which case they are called aponeuroses. Sometimes a tendon is found in the middle of a muscle as well as at each end of it. Synovial Sheaths and Sacs.
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