Gemmell R T, Nelson J
Department of Anatomy, University of Queensland, Brisbane, Australia.
Cell Tissue Res. 1988 Jun;252(3):683-5. doi: 10.1007/BF00216657.
The lungs of newborn northern native cats, Dasyurus hallucatus and newborn brushtail possums, Trichosurus vulpecula were examined by both light and electron microscopy. The native cat has a birth weight of 18 mg after a gestation of about 21 days, whereas the brushtail possum weights 200 mg at birth and has a gestation period of 17.5 days. The lungs of the native cat are two large respiratory sacs, with a respiratory lining of squamous cells and surfactant-secreting cells. The capillaries are located within the connective tissue just below this respiratory epithelium. The visceral covering of the lung is formed by squamous cells. The lungs of the possum are composed of numerous large respiratory sacs which are separated by connective tissue septa in which the capillaries are located. The sacs, as in other species, are lined with squamous cells and surfactant-secreting cells. It is proposed that the structure of the lung of the newborn marsupial is related more to the size of the newborn rather than to the length of the gestation period.
通过光学显微镜和电子显微镜对新生的北袋鼬（Dasyurus hallucatus）和新生的帚尾袋貂（Trichosurus vulpecula）的肺部进行了检查。袋鼬在大约21天的妊娠期后出生体重为18毫克，而帚尾袋貂出生时体重为200毫克，妊娠期为17.5天。袋鼬的肺是两个大的呼吸囊，有一层由鳞状细胞和表面活性剂分泌细胞组成的呼吸内衬。毛细血管位于该呼吸上皮下方的结缔组织内。肺的脏层由鳞状细胞构成。袋貂的肺由许多大的呼吸囊组成，这些呼吸囊被含有毛细血管的结缔组织间隔隔开。与其他物种一样，这些囊内衬有鳞状细胞和表面活性剂分泌细胞。有人提出，新生有袋动物肺部的结构与其新生时的大小关系更大，而非与妊娠期的长短有关。
