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Results 1 - 1 of 1 for back spasm of muscle
  1. Parathyroidectomy - series (image) 
    ... glands are located near or attached to the back side of the thyroid gland. The parathyroid glands secrete a hormone that controls blood levels of calcium.
    https://medlineplus.gov/ency/presentations/100093_1.htm - Medical Encyclopedia