Which structure is the midline tendon of the anterior abdominal wall extending from the xiphoid process to the pubic symphysis?

• A. Linea alba
• B. Linea semilunaris
• C. Rectus sheath
• D. Transversalis fascia

Answer: (A)

The midline tendon extending from the xiphoid process to the pubic symphysis is the linea alba. It’s a fibrous seam formed by the fusion of the aponeuroses of the external oblique, internal oblique, and transversus abdominis muscles on both sides. This central tendon separates the two rectus abdominis muscles and provides a strong, relatively avascular joining point for the anterior abdominal wall. The other structures are located elsewhere: the linea semilunaris marks the lateral border of the rectus abdominis, the rectus sheath surrounds the rectus muscles, and the transversalis fascia lies deeper beneath the abdominal wall. The linea alba is the preferred site for many abdominal incisions because it minimizes muscle disruption and bleeding.