Okay, so the intestinal wall, like this one, has lots of ridges and grooves, and also can be separated into the mucosal layer, submucosal layer, muscle layer, and serosa.

好，那肠壁有很多的脊和槽，像这个图片一样，肠壁还可以被分成黏膜层、黏膜下层、肌层和浆膜层。

Remember that those plexuses are in the muscle layer or submucosal layer, so a normal biopsy with just the mucosa wouldn't cut it, you need a sample of submucosa to see if the submucosal plexus is there or not, right?

记住！神经丛存在于肌层或黏膜下层，因此普通黏膜活检无法取到，需要黏膜下层的标本来检查是否有黏膜下层神经丛。

Surrounding the mucosal layer is the submucosal layer, made of loose areolar connective tissue, which helps provide the elasticity that the tube needs when you eat a whole pizza in one sitting, and it contains more blood vessels.

粘膜层周围是粘膜下层，由松散的乳晕结缔组织组成，这有助于提供管子所需的弹性（比如说当你一次吃一整块比萨饼时），它包含更多的血管。