Anus anus
The anus is partly formed of superficial layers of the body, including the skin, and part of the intestine. The rectum mucosa, very similar to the rest of the intestinal mucosa, consists of a red glowing cloth containing mucus glands. The rectum mucous membrane is relatively painless, while the anus and surrounding skin nerves located outside are very sensitive to painful stimulus.
Veins from the rectum and anus come mainly in the door vein, which leads to liver and systemic circulation. Some of these veins join directly in the pelvic veins, then in the systemic circulation. The lymphatic vessels of the rectum drain into the lower abdominal lymph nodes. The anus lymphatic vessels drain into the groin lymph nodes.
A muscle ring (the anal sphincter) keeps the anus closed. This sphincter is subconsciously controlled by the autonomous nervous system. However, part of the sphincter can be voluntarily released or contracted.
Anal channel channel
The anal channel is a tube that measures about 4 cm long. It connects the anus to the rectum, the part of the large intestine where the saddles build up. The junction between the rectum and the anal channel is referred to as the ano-rectal line.
The anal channel is surrounded by ring-shaped muscles called internal anal sphincter and external anal sphincter. The anal sphincters are relaxing to evacuate the saddles.
The anal channel is upholstered with a mucous membrane, i.e. a thin layer of wet tissue. It contains glandular cells that secrete mucus (a thick and lubricating liquid). This mucus contributes to easy removal of saddles out of the body. The top part of the anal channel has epithelium folds called anal columns. The bottom part of the anal channel consists of malpighian cells. The area where anal columns make way for malpighian cells corresponds to the pectin line. At anus level, wet tissue is starting to get dry and look more like the skin covering the rest of the body
Functional Function
Anus is the end of the gastrointestinal tract (GI), or digestive tract. When the rectum is full, the urge to defecate is felt. The internal anal sphincter releases and moves the saddles from the rectum to the anal channel. Once the external anal sphincter releases, the saddles are sent out of the body by the anus.
Anal cleaning is the hygienic practice that a person performs on the anal zone by themselves after defecation. Anus and butt can either be washed with liquids or wiped with toilet paper or other solid materials to remove leftover faecal material. In many Muslim and Hindu cultures, as well as in Southeast Asia and Southern Europe, water is usually used for anal cleaning using a water jet, like with a bidet or most often splashed and Hand washed. This can be followed by drying with a cloth towel or toilet paper.
Anus and rectum diseases include:
Anal cancer
Anal crack
Anal itching
Anorectal abscess
Anorectal fistula
Colorectal cancer
Fecal Incontinence
Foreign body in anus and rectum
Hemorrho
Raising muscle syndrome
Pestonidal disease
Rectite
Rectal Prolapse