During thyroid surgery, the recurrent laryngeal nerve (RLN) is most at risk at which specific anatomical point?
- A Where it crosses the inferior thyroid artery near the lower pole of the thyroid ✓
- B At the thoracic inlet where it loops around the aortic arch (left) or subclavian artery (right)
- C Where it enters the larynx below the inferior constrictor
- D As it runs in the groove between the trachea and esophagus
Correct answer: A. Where it crosses the inferior thyroid artery near the lower pole of the thyroid
Explanation
The most vulnerable point for surgical injury to the RLN is where it crosses the inferior thyroid artery, typically near the lower pole of the thyroid gland. The relationship is variable — the nerve may pass anterior, posterior, or between branches of the artery. Surgeons identify and protect this crossing point. The nerve-artery relationship varies but the crossing near the inferior thyroid artery is the highest-risk zone during thyroid/parathyroid surgery.
Reference: BD Chaurasia's Human Anatomy, 8th ed.
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Written and medically reviewed by the StethoPrep medical team.