What is the name of the avascular strip of tissue at the midline which runs from the xiphoid process to the pubis?

The term that describes the avascular strip of tissue at the midline of the abdomen, extending from the xiphoid process to the pubis, is known as the linea alba. This structure is composed of collagen fibers and provides a crucial functional role in the abdominal wall by serving as an attachment site for various abdominal muscles.

The linea alba is significant in surgical procedures as it is often used as an incision site due to its avascular nature, which helps minimize bleeding during surgery. The absence of major blood vessels within this strip decreases the risk associated with cutting through tissues, making it a preferred area for incision.

In contrast, the linea semilunaris refers to a curved line representing the lateral border of the rectus abdominis muscle and does not serve the same purpose as the linea alba. The arcuate line marks the lower limit of the posterior layer of the rectus sheath and has a different anatomical significance. The midaxillary line is an imaginary vertical line that runs along the midaxillary region of the body, often used in clinical assessments but unrelated to the structure described in the question.