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MBBS QUESTION #10210
Question 1
During thyroidectomy, the superior parathyroid glands are more consistently and predictably located than the inferior parathyroid glands. This is best explained by their differing embryological origin from which pharyngeal pouch?
  • Superior parathyroids arise from the third pharyngeal pouch (with the thymus)
  • Superior parathyroids arise from the fourth pharyngeal pouch, with a shorter migration than the inferior glands✔️
  • Both superior and inferior parathyroids arise from the second pharyngeal pouch
  • Superior parathyroids arise from the first pharyngeal pouch
Correct Answer Explanation
The superior parathyroid glands develop from the fourth pharyngeal pouch and migrate only a short distance, giving them a fairly constant position posterior to the thyroid; the inferior parathyroid glands arise from the third pouch (alongside the thymus) and migrate further caudally, accounting for their more variable final location.