caecum 盲肠 A cecum is present in most amniote species, and also in lungfish, but not in any living species of amphibian. In reptiles, it is usually a single median structure, arising from the dorsal side of the large intestine. Birds typically have two paired ceca, as, unlike other mammals, do hyraxes. Most mammalian herbivores have a relatively large cecum, hosting a large number of bacteria, which aid in the enzymatic breakdown of plant materials such as cellulose; in many species, it is considerably wider than the colon. In contrast, obligatory carnivores, whose diets contain little or no plant material, have a reduced cecum, which is often partially or wholly replaced by the vermiform appendix. Many fish have a number of small outpocketings, called pyloric ceca, along their intestine; despite the name they are not homologous with the cecum of amniotes, and their purpose is to increase the overall area of the digestive epithelium.[2] Some invertebrates, such as squid,[3] may also have structures with the same name, but these have no relationship with those of vertebrates. A pouch in the digestive tract that connects the ileum with the ascending colon of the large intestine. It is separated from the ileum by the ileocecal valve, and is the beginning of the large intestine. It is also separated from the colon by the cecocolic junction. BTO:0000166 CALOHA:TS-0122 EFO:0000850 EHDAA2:0000206 EHDAA:3913 EMAPA:35197 EV:0100397 FMA:14541 GAID:307 Kardong: in some herbivorous lizards, a cecum is present between small and large intestines MA:0000334 MESH:A03.492.411.495.209 MIAA:0000288 OpenCyc:Mx4rve6u4JwpEbGdrcN5Y29ycA UBERON:0001153 UMLS:C0007531 VHOG:0001559 blind intestine blindgut caeca caecal caecum ceca cecum galen:Cecum intestinum caecum intestinum crassum caecum intestinum crassum cecum uberon Kardong：在一些食草蜥蜴中，盲肠存在于小肠和大肠之间 在消化道中的一个小袋，连接着回肠和大肠的升结肠。它被回盲瓣与回肠分开，并且是大肠的开始。它也通过结肠交界处与结肠分开。 大肠盲肠(intestinum crassum caecum) 大肠盲肠(intestinum crassum cecum) 盲肠 盲肠 盲肠(blind intestine) 盲肠(blindgut) 盲肠(caeca) 盲肠(ceca) 盲肠(cecum) 盲肠存在于大多数羊膜物种中，也存在于肺鱼中，但不存在于两栖动物的任何活物种中。在爬行动物中，它通常是一个单一的中位结构，产生于大肠的背侧。与其他哺乳动物不同，鸟类通常有两对盲肠。大多数哺乳动物食草动物有一个相对较大的盲肠，容纳大量的细菌，这有助于植物材料如纤维素的酶分解；在许多物种中，它比结肠宽得多。相反，强制性食肉动物，其饮食含有很少或没有植物材料，有一个缩小的盲肠，这往往是由阑尾部分或全部取代。许多鱼沿着肠道有许多小的外囊，被称为幽门盲肠；尽管它们的名字与羊膜盲肠不同源，但它们的目的是增加消化上皮的总面积。[2]一些无脊椎动物，例如鱿鱼，[3]也可能具有相同名称的结构，但这些结构与脊椎动物的结构没有关系。 肠盲肠 digestive tract diverticulum 消化道憩室