The pyriform lobe cortex pyramidal cells develop very early too and it appears in the inner side , the granular cells begin to develop from the eighteenth week 梨状叶皮质锥体细胞发育的较早，最先出现在深层，颗粒层第18周出现。
2.
Methods : among these 32 patients with narrow nasal valve , 10 were operated with anterior inferior turbinectomy , 4 with deviation orthopedic of protruding trian gular outer cartilage ( 2 on the left , 2 on both sides ) , 6 with bone - widen operation of osseous pyriform aperture ( 2 on the left , 4 on both sides ) . the nasal ventilation before and after operation was observed 方法: 32例鼻瓣膜区狭窄患者,行下鼻甲前端切除术10例,鼻外侧软骨凸出矫正术4例(左侧2例、双侧2例) ,骨性梨状孔狭窄扩大术6例(左侧2例、双侧4例) ,观察手术前后鼻通气改善情况以判定疗效。
