The rectum and anus are the final part of the digestive system. The rectum stores stool until it leaves the body through the anus. The sphincter muscles help control bowel movements. Surrounding the rectum is fatty tissue called the mesorectum, which contains blood vessels and lymph nodes. These lymph nodes are part of the body's immune system.
妙佑医疗国际不为任何公司或产品背书。广告收入为我们的非营利使命提供支持。
浏览妙佑医疗国际出版社提供的畅销书以及书籍和简报的特别优惠。
您的捐赠可以抵税。请您慷慨解囊，和我们一起进行尖端研究和医护，共同推动医学的改变。