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== '''Embryology''' == * The two pairs of parathyroid glands develop from the 3rd and 4th pharyngeal pouches in about week five of gestation ** Superior parathyroid from dorsal 4th pouch *** Attaches itself to the dorsal surface of the caudally-migrating thyroid (which has partly formed from the ventral fourth pouch) *** More predictable anatomic location ** Inferior parathyroid from the 3rd pouch, along with thymus *** Inferior parathyroid from dorsal region *** Thymus from ventral region *** Both organs together begin migrating caudally in week six *** The thymus eventually fuses with its counterpart from the other side *** Leads to a more variable position for the inferior parathyroid, since it has further to travel
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