Intersphincteric groove

Intersphincteric groove is an anatomical structure found in the human body, specifically within the anal canal. It is a shallow groove that separates the internal anal sphincter and the external anal sphincter. The intersphincteric groove plays a crucial role in maintaining fecal continence.

Anatomy

The intersphincteric groove is located in the lower part of the anal canal. It is a shallow depression that separates the internal and external anal sphincters. The internal anal sphincter is a smooth muscle that is involuntary and maintains constant contraction. The external anal sphincter, on the other hand, is a skeletal muscle that is voluntary and can be consciously controlled.

Function

The primary function of the intersphincteric groove is to aid in the maintenance of fecal continence. It allows for the separate contraction and relaxation of the internal and external anal sphincters. This coordinated action helps to prevent involuntary passage of feces and gas.

Clinical significance

The intersphincteric groove can be affected by various medical conditions. For instance, in anal fissure, a tear in the lining of the lower rectum, the intersphincteric groove may become more pronounced. In anal cancer, the groove may be obliterated. The groove can also be involved in certain surgical procedures, such as the intersphincteric resection for rectal cancer.

See also

• Anal canal
• Internal anal sphincter
• External anal sphincter
• Fecal incontinence
• Anal fissure
• Anal cancer
• Intersphincteric resection