正常回肠末段外观，上图显示回盲瓣和黏膜上的几个较暗的椭圆形肠道集合淋巴结。下图显示肠道集合淋巴结（黏膜下层淋巴组织集中的地方）。皱褶不如在空肠那样明显。如下面的结肠镜检图清楚显示的一样。
This is the normal appearance of terminal ileum. In the upper frame, note the ileocecal valve, and several darker oval Peyer's patches are present on the mucosa. In the lower frame, a Peyer's patch, which is a concentration of submucosal lymphoid tissue, is present. Note the folds are not as prominent here as in the jejunum, as evidenced by the colonoscopic view below.
