The Cernea classification grades the relationship between the external branch of the superior laryngeal nerve (EBSLN) and the superior thyroid vessels. In Type 2b, the nerve crosses the superior thyroid vessels:

• A More than 1 cm above the superior thyroid pole
• B Less than 1 cm above the superior thyroid pole
• C Directly on the cricothyroid muscle without crossing vessels
• D Below the superior thyroid pole, within the capsule ✓

Explanation

Cernea Type 1: nerve crosses >1 cm above superior pole; Type 2a: crosses <1 cm above; Type 2b: nerve crosses below the superior pole, deep to vessels — most at risk of injury during superior pole dissection. Recognition of this classification guides meticulous vessel ligation close to the thyroid capsule to protect the EBSLN in Type 2b anatomy.

Reference: Bailey & Love's Short Practice of Surgery, 27th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.