peräaukkokanavasta

The peräaukkokanava, often referred to as the anal canal, is the final section of the large intestine terminating at the anus. It is a short passage, typically measuring about 3 to 4 centimeters in length in adults. The anal canal plays a crucial role in the process of defecation. Its walls are lined with specialized mucosa and are surrounded by a complex arrangement of muscles, primarily the internal and external anal sphincters. These sphincters are involuntary and voluntary muscles, respectively, that control the opening and closing of the anus, allowing for the controlled release of feces.

The lining of the anal canal features longitudinal folds called anal columns. These columns contain blood vessels and are important in maintaining continence. The junction between the anal canal and the rectum is marked by the anorectal junction. The peräaukkokanava is susceptible to various medical conditions, including hemorrhoids, anal fissures, and fistulas, which can cause pain, bleeding, and discomfort. Its anatomy and function are essential for maintaining digestive health and overall well-being.