We also talked about how epithelial cells are polar, having both apical and basal sides, and are selectively permeable, and lastly we took a brief look at how our glandular epithelial tissue forms both out endocrine and exocrine glands.

们还讨论了上皮细胞是如何极性的，具有顶端和基底两侧，并且具有选择性渗透性，最后们简要了了们的腺上皮组织如何形成内分泌腺和外分泌腺。

Finally, at the lower esophageal sphincter, the squamous epithelium joins the columnar gastric epithelium to form the gastroesophageal junction.

最后，在食管下括约肌处，食管鳞状上皮移柱状上皮，形成了-食管交界区。

And then there is the glandular epithelium, which forms glands and secretes hormones and other substances.

然后是腺上皮，形成腺体并分泌激素和其他物质。

Unlike the cells that go on to form, say, your epithelium, which are fixed and neatly arranged in sheets, mesenchymal cells can be situated any-which-way, and can move from place to place.

与形成上皮细胞的细胞不同，间充质细胞可以位于任何方向，并且可以从一个地方移动到另一个地方。