All about the anus

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The pseudostratified columnar epithelium of the gastrointestinal tract transitions to stratified squamous epithelium at the pectinate line. So we try to get serious, to focus, and ask why has no one gotten to the bottom of this particular mystery before? Retrieved August 19, From Cells to Society. The lymph vessels of the rectum drain into lymph nodes in the lower abdomen. Most deuterostomes, a superphlum of animals including sea stars, sea cucumbers, and all vertebrates such as birds, fish and mammals such as humans, have an anal opening in some groups, such as reptiles and birds, the anal opening is fused with the reproductive opening, forming a structure called a cloaca. Anal stretching or fisting is pleasurable for some, but it poses a more serious threat of damage due to the deliberate stretching of the anal and rectal tissues; its injuries include anal sphincter lacerations and rectal and sigmoid colon rectosigmoid perforation, which might result in death.

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Foreign objects in the anus and rectum.

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Human anus

Just imagine if we have to wait for lunch, because we still have not gotten rid of the remnants of the breakfast. However, part of the sphincter can be relaxed or tightened at will. Foreign objects in the anus and rectum. Most deuterostomes, a superphlum of animals including sea stars, sea cucumbers, and all vertebrates such as birds, fish and mammals such as humans, have an anal opening in some groups, such as reptiles and birds, the anal opening is fused with the reproductive opening, forming a structure called a cloaca. During pubertyas testosterone triggers androgenic hair growth on the body, pubic hair begins to appear around the anus.

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all about the anus
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3 thoughts on “All about the anus

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