"Z"-plasty; acquired stenosis of anterior naris; treatment.
“Z”成形术；后天性前鼻孔狭窄；手术治疗。
2
Nasal process of premaxilla forms the whole posterior margin of the naris.
背突构成整个外鼻孔的后缘。
3
With the development of the fish, the anterior naris of the fry rose above the external surface and developed into a tubular extension, which opened to the outside.