Explain anatomically the pectinate line скачать в хорошем качестве

Explain anatomically the pectinate line

The pectinate line, also known as the dentate line, refers to an anatomical demarcation in the anal canal that separates two distinct regions. Here are 10 lines to describe the pectinate line: The pectinate line is a transitional zone located in the anal canal. It marks the boundary between the upper two-thirds and lower one-third of the anal canal. The upper two-thirds of the anal canal is lined with columnar epithelium. The lower one-third of the anal canal is lined with stratified squamous epithelium. The pectinate line corresponds to the level of the pelvic diaphragm in the human body. It is named pectinate due to the presence of numerous parallel vertical folds, resembling a comb, in the anal canal above this line. The vertical folds are called anal columns or Morgagni columns and contain blood vessels and lymphatics. Above the pectinate line, the anal canal receives its blood supply from the superior rectal artery, a branch of the inferior mesenteric artery. Below the pectinate line, the blood supply is derived from the inferior rectal artery, a branch of the internal pudendal artery. Clinically, the pectinate line is an important landmark as it is associated with the occurrence of different types of anal diseases, such as hemorrhoids and anal fissures, which are more common below the line. Please note that this information is based on general anatomical knowledge and may not constitute medical advice. It's always best to consult a healthcare professional for specific medical concerns or questions.