Extralaryngeal Terminal Division of the Inferior Laryngeal Nerve: Anatomical Classification by a Surgical Point of View

Table 3

The incidence of terminal division of the ILN according to anatomical classification.

Type	Regions	Definition	Right	Left	Total
1	Arterial	Division occurs at or closely adjacent to neurovascular crossing.	9 (47.4)*	16 (45.7)	25 (46.3)
2	Postarterial	Division occurs in the first (proximal) half of the distance between neurovascular crossing and laryngeal entry.	7 (36.8)	10 (28.6)	17 (31.5)
3	Prelaryngeal	Division occurs in the second (distal) half of the distance between neurovascular crossing and laryngeal entry.	2 (10.5)	4 (11.4)	6 (11.1)
4	Prearterial	Division occurs before (proximal to) neurovascular crossing.	1 (5.3)	5 (14.3)	6 (11.1)
			19 (100)	35 (100)	54 (100)

∗Numbers in parentheses are percentages.