The linea semilunaris is a curved tendinous line placed one on either side of the rectus abdominis.

Each corresponds with the lateral border of the rectus, extends from the cartilage

Cartilage

Cartilage is a flexible connective tissue found in many areas in the bodies of humans and other animals, including the joints between bones, the rib cage, the ear, the nose, the elbow, the knee, the ankle, the bronchial tubes and the intervertebral discs...

 of the ninth rib

Rib

In vertebrate anatomy, ribs are the long curved bones which form the rib cage. In most vertebrates, ribs surround the chest, enabling the lungs to expand and thus facilitate breathing by expanding the chest cavity. They serve to protect the lungs, heart, and other internal organs of the thorax...

 to the pubic tubercle

Pubic tubercle

The pubic tubercle is a prominent forward-projecting tubercle on the upper border of the medial portion of the superior ramus of the pubis...

, and is formed by the aponeurosis

Aponeurosis

Aponeuroses are layers of flat broad tendons. They have a shiny, whitish-silvery color, are histologically similar to tendons, and are very sparingly supplied with blood vessels and nerves. When dissected, aponeuroses are papery, and peel off by sections...

 of the internal oblique at its line of division to enclose the rectus, reinforced in front by that of the external oblique, and behind by that of the transversus.

External links

- "The Linea Alba

Linea alba

The linea alba is a fibrous structure that runs down the midline of the abdomen in humans and other vertebrates. The name means white line and the linea alba is indeed white, being composed mostly of collagen connective tissue....

and Linea Semilunaris" - "Insertions of Rectus Abdominis, Anterior View"