frontonasal

Bilateral oal thickenings of the surface ectoderm, called nasal placodes, then deelop on each side of the inferior part of the frontonasal prominence.

外胚层表面呈双边卵圆增厚鼻板，然后发展鼻隆起的下半部分。

The origin of flaps was frontonasal flap in 58 cases, bilobed flap in 67 cases, reforming rhomboid flap in 152 cases, nasolabial flap in 118 cses, forehead falp in 33 cases.

瓣来源鼻瓣58例，双叶瓣67例，改良瓣152例，鼻唇沟瓣118例，正中瓣33例。