阑尾炎和疝气.doc

Appendix In infants, the appendix isa conical diverticulum at the apex of the cecum, but with differential growth and distention of the cecum, the appendix ultimately arises on the left and dorsally approximately cm below the ileocecal valve. The aptaenia of the colon converge at thc base of the appendix, an arrangement that helps in locating this structure at operation. The appendix is fixed retrocecally in 16% of adults and is freely mobile in the remainder. The appendix in youth is characterized bya large concentration of lymphoid follicles that appear 2 weeks after birth and number about 200 or more at age 15. Thereafter, there is progressive atrophy of lymphoid tissue, itant with fibrosis of the wall and partial or total obliteration of the lumen. If the appendix has a physiologic function, it is probably related to the presence of lymphoid follicles. Reports ofa statistical relationship between appendectomy and subsequent carcinoma of the colon and other neoplasms in humans are not supported by controlled studies. conical 圆锥的; 圆锥形的 diverticulum 肠盲囊, 小囊突, 憩室 apex 顶点, 最高点 cecum 盲肠 distention 膨胀; 延伸 dorsally 背侧地 ileocecal valve 回盲瓣 retrocecally 盲肠后的 lymphoid follicles 淋巴样滤泡, 淋巴小结; progressive atrophy 萎缩 itant 伴发的, 伴行的, 并发的 itant with 协同 obliteration 涂去, 抹消, 删除 lumen 管腔, 流明,腔 appendectomy 阑尾切除术 neoplasm 肿瘤 ileocecal lymphoid appendicitis 阑尾炎 Hernia An external hernia is a