Parathyroid glands are typically located on the posterior aspect of the thyroid gland.

• A. Anterior surface
• B. Posterior aspect
• C. Inside the thyroid
• D. In the carotid sheath

Answer: (B)

Parathyroid glands are normally tucked behind the thyroid, sitting on its posterior surface just under the thyroid capsule. This posterior location is where the glands develop and migrate to, and two pairs (superior and inferior) end up there in most people. Being on the back of the thyroid keeps them separate from the thyroid tissue itself, yet close enough to share a common blood supply from the inferior thyroid arteries. The other locations described—anterior surface, inside the thyroid, or in the carotid sheath—don’t reflect where these glands are typically found; the anterior surface is in front of the thyroid, intrathyroidal tissue would mean the glands are embedded within the thyroid tissue, and the carotid sheath lies lateral to the thyroid and contains vessels and nerves, not the parathyroids.