在小肠的管腔内壁有环形皱襞,有无数的绒毛覆盖它的表面。此外,在人的小肠,特别是在回肠粘膜上分布着两种淋巴小结。其一是集合淋巴小结(派伊尔板),另一种是孤立淋巴小结。在任何情况下,从管腔内侧壁看每个淋巴小结上皮都呈现圆顶形,它的周围有众多的绒毛围绕着。占据淋巴小结 Annular lumen in the small intestine annular fold, there are numerous pieces of hair covered its surface. In addition, there are two types of lymph nodes distributed in the human small intestine, especially in the ileum mucosa. One is a collection of lymph nodes (Peyer’s board), and the other is isolated lymph nodes. In any case, each of the lymph node tubules presents a domed shape from the medial wall of the lumen and is surrounded by numerous villi. Occupy lymph nodes