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Friedman classification
| Type 1 | The EBSLN courses entirely on the surface of the inferior pharyngeal constrictor muscle |
| Type 2 | While coursing on the surface of the inferior pharyngeal constrictor muscle, the EBSLN enters into the inferior pharyngeal constrictor muscle about 1 cm proximal of the cricothyroid muscle |
| Type 3 | The EBSLN courses under the inferior pharyngeal constrictor muscle up to the cricothyroid muscle |
