Which structure is located posterior and medial to the left lobe of the thyroid gland?

Which structure is located posterior and medial to the left lobe of the thyroid gland?

• A. Esophagus
• B. Trachea
• C. Carotid artery
• D. Jugular vein

Answer: (A)

The structure behind and toward the midline relative to the left thyroid lobe is the esophagus. In the neck, the thyroid glands sit on either side of the trachea, with their posterior surfaces touching structures behind them. The esophagus runs posterior to the trachea and tends to lie just medial to the left lobe, making it the structure located posterior and medial to that lobe. The trachea itself is more central and anterior to the thyroid, so it isn’t the posterior and medial neighbor. The carotid artery and jugular vein lie lateral to the thyroid lobes within the carotid sheath, not behind and toward the midline.

The structure behind and toward the midline relative to the left thyroid lobe is the esophagus. In the neck, the thyroid glands sit on either side of the trachea, with their posterior surfaces touching structures behind them. The esophagus runs posterior to the trachea and tends to lie just medial to the left lobe, making it the structure located posterior and medial to that lobe.

The trachea itself is more central and anterior to the thyroid, so it isn’t the posterior and medial neighbor. The carotid artery and jugular vein lie lateral to the thyroid lobes within the carotid sheath, not behind and toward the midline.