Orlandini G E, Delrio A N, Orlandini S Z, Pacini P, Manneschi L I, Gulisano M
Dipartimento di Anatomia Umana e Istologia dell'Università di Firenze.
Ital J Anat Embryol. 1996 Jul-Sep;101(3):141-53.
The lung buds of 15 human fetuses from the 9th to the 14th week of i.u. life were examined by scanning electron microscopy (SEM). SEM allows to clearly evidentiate the branching pattern of the respiratory tree, the development of the vascular network, the differentiation of the layers in the bronchial wall and the maturation of the epithelium. Particularly, as concerns the epithelium, its pattern in the air conducting ways and in the respiratory zone appears to be different from the very start; the presence of vascular spaces and then of well-defined vessels can be already detected starting from the 9th week of development.
对15例孕龄9至14周的人类胎儿肺芽进行扫描电子显微镜（SEM）检查。SEM能够清晰地显示呼吸树的分支模式、血管网络的发育、支气管壁各层的分化以及上皮的成熟情况。特别是关于上皮，其在气道和呼吸区的模式从一开始就似乎有所不同；从发育的第9周开始就能检测到血管间隙，随后是明确的血管。
