Arcuate line

Arcuate Line

The arcuate line is a significant anatomical feature found in the human body. It is a horizontal line that demarcates the lower limit of the posterior layer of the rectus sheath in the anatomical structure of the abdomen. The arcuate line is also known as the "linea semicircularis" or the "Douglas line".

Anatomy

The arcuate line is located approximately midway between the umbilicus and the pubic symphysis. It is the point where the characteristics of the rectus sheath change. Above the arcuate line, the rectus sheath is composed of the aponeuroses of the internal oblique muscle and the external oblique muscle, with the rectus abdominis muscle situated in between. Below the arcuate line, all three aponeuroses pass anterior to the rectus abdominis, leaving it unsupported posteriorly.

Clinical Significance

The arcuate line's location and characteristics have implications in surgical procedures involving the abdomen, particularly in the lower abdominal region. Surgeons must be aware of the arcuate line when performing procedures such as hernia repair, as the lack of posterior support below the line can impact the success of the surgery and the patient's recovery.

See Also

• Rectus sheath
• Abdomen
• Internal oblique muscle
• External oblique muscle