终末细支气管

结果：组织学上显示，对照组大鼠呼吸道包括支气管、细支气管、终末细支气管、肺泡管的上皮细胞和血管内皮细胞NOS表达均阳性，肺泡上皮细胞NOS表达阴性；

RESULTS : Histochemically , in normal rats , the NOS positive staining was found in epithelial cells of respiratory duct including bronchi , alveolar duct as well as in endothelium of pulmonary vessels , and the negative staining was found in pneumonocytes .

结果表明：HRCT能显示正常次级肺小叶结构中的部分小叶间隔、小叶肺动脉，但不能在同一层面显示次级肺小叶的完整结构，不能显示核心结构中的终末细支气管。

The results showed that HRCT could display normal interlobular septa and lobular arteries in the lobular core of the fresh lungs , but not all of them at the same level . The normal terminal bronchioles were not visible in our investigation .

随胎龄增加，叶支气管、小支气管、细支气管、终末细支气管、呼吸性细支气管和肺泡导管管壁的粘膜上皮间均可见阳性细胞。

With the development , these cells could be seen in the epithelium of bronchi , bronchioles and alveolar ducts .

与终末细支气管同行的小动脉外膜下淋巴管，以及细支气管外膜下的淋巴管腔内，未见瓣膜；自该级以远的淋巴管为毛细管性。

The fact that the valve is absent in the lymphatic vessel under the external membrane of both the bronchiole and the arteriole of related to the terminal bronchiolus shows that the lymphatic vessel farther off is capillary .