The middle layer is the lamina propria and it contains blood and lymph vessels.

粘膜层的中层为固有层，内含血管和淋巴管。

Inside the stomach, the epithelial layer is made up of cylindrical cells, which dive into the lamina propria, forming pits.

在胃内，上皮层由柱状细胞组成，这些细胞深入固有层，形成凹坑。

Lastly the gastric mucosa is highly vascularized, which helps deliver oxygen and bicarbonate and carry away acid that makes it through into the lamina propria.

最后，胃粘膜高度血管化，这有助于输送氧气和碳酸氢盐并带走酸，使其通过固有层。

Going deeper past that layer you've got the basement membrane and loose connective tissue, called the lamina propria—which together with the epithelium makes up the mucosa.

更深层由基底膜细胞和疏松结缔组织组成，被称为基底层，它和上皮层一起组成了气道的黏膜层。

In the bronchioles you've got the lumen, the mucosa which includes the inner lining of epithelial cells as well as the lamina propria, and the submucosa which is where the smooth muscle lives.

在细支气管内，有腔体、粘膜（包括上皮细胞的内层、固有层），以及粘膜下层，也就是平滑肌所在的地方。

The mucosa also has three layers of its own: a layer made of stratified squamous epithelium; a layer of connective tissue, called the lamina propria; and a layer of muscle cells, called the muscularis mucosae.

黏膜层本身又由三层结构组成，一层复层鳞状上皮，一层结缔组织，又叫固有层，还有一层肌细胞，又叫黏膜肌层。

Beneath the epithelium, there's another layer called the basement membrane made of tough connective tissue, and below that is the lamina propria which has yet more connective tissue that houses blood vessels, lymphatics, nerves, and immune cells.

在这层上皮下面的是另一层称为基底膜的结构，由坚硬的结缔组织构成，再往下是固有层，其包含更多结缔组织，容纳了血管、淋巴管、神经和免疫细胞。