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Parathyroid, calcium, and bone metabolism 

Parathyroid, calcium, and bone metabolism
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date: 16 June 2019

Humans have two pairs of parathyroid glands lying in the anterior cervical region. The fetal parathyroid glands begin developing at 5 weeks from the third and fourth pharyngeal pouches. The third pharyngeal pouch, which contains tissue that will become the thymus and parathyroid, migrates downward and gives rise to the two inferior parathyroid glands normally located at the lower poles of the thyroid. The fourth pharyngeal pouch does not migrate and gives rise to the two upper parathyroid glands, which normally are attached to the upper poles of the thyroid (1).

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