Zhang Haili, Wu Hongsong, Lu Wen, Chang Yanli, Li Chunhua, Chu Dechang, Chen Yan, Han Xue, Li Na
College of Agriculture and Bioengineering, Heze University, Heze, Shandong, China.
Boshan First Middle School, Zibo, Shandong, China.
J Histotechnol. 2023 Mar;46(1):28-38. doi: 10.1080/01478885.2022.2105490. Epub 2022 Aug 1.
The digestive tract development of the embryo is described through the observation of the embryonic morphology on hematoxylin and eosin stained tissue sections. During the first 9 days of embryonic development, the anterior intestine of the embryo divides into the oral cavity, pharyngeal cavity, esophagus, stomach, and small intestine, while the caudal intestine differentiates into the cloaca, the anterior and caudal tubes of the large intestine. Between days 10-24, the wall of the digestive tract forms a two-layer structure consisting of mucosa and submucosa. The endoderm evolves into epithelial tissue in each part of the digestive tract, the mesoderm goes from a dense cluster of cells to looser mesenchymal tissue then divides into loose connective tissue, mesothelium, and muscle tissue. There is no clear temporal boundary between development of mesenchymal tissue and the early loose connective tissue, which is a gradual process.
通过对苏木精和伊红染色组织切片上胚胎形态的观察来描述胚胎的消化道发育。在胚胎发育的前9天，胚胎的前肠分为口腔、咽腔、食管、胃和小肠，而尾肠分化为泄殖腔、大肠的前后段。在第10 - 24天之间，消化道壁形成由黏膜和黏膜下层组成的两层结构。内胚层在消化道各部分演变为上皮组织，中胚层从密集的细胞团发展为较松散的间充质组织，然后分化为疏松结缔组织、间皮和肌肉组织。间充质组织发育与早期疏松结缔组织之间没有明确的时间界限，这是一个渐进的过程。
