Linea semilunaris

Not to be confused with Linea semicircularis.

Linea semilunaris
The Obliquus externus abdominis. (Linea semilunaris labeled vertically at center, at border between brown and gray.)
Linea semilunares are at lateral borders of rectus abdominis.
Identifiers
TA	A04.5.01.025
FMA	19929
*Anatomical terminology* [edit on Wikidata]

The linea semilunaris (also semilunar line or Spigelian line) is a curved tendinous intersection found on either side of the rectus abdominis muscle.

Each corresponds with the lateral border of the rectus abdominis, extends from the cartilage of the ninth rib to the pubic tubercle, and is formed by the aponeurosis of the internal oblique at its line of division to enclose the rectus, reinforced anteriorly by the external oblique and posteriorly by the transversus abdominis above the arcuate line (also known as linea semicircularis or Douglas' line).

A hernia through the linea semilunaris is called a Spigelian hernia, which is also referred to as a spontaneous lateral ventral hernia.

External links

Anatomy photo:35:06-0102 at the SUNY Downstate Medical Center - "The Linea Alba and Linea Semilunaris"
Atlas image: abdo_wall52 at the University of Michigan Health System - "Insertions of Rectus Abdominis, Anterior View"

Muscles and ligaments of abdomen and pelvis

Abdominal wall

Anterior/
lateral

Muscle

Fascia

Abdominal fascia panniculus adiposus Fascia of Camper Membranous layer Fascia of Scarpa Transverse fascia Interfoveolar ligament Linea alba Linea semilunaris

Inguinal	Inguinal triangle Inguinal canal Deep inguinal ring Superficial inguinal ring Intercrural fibers Crura of superficial inguinal ring Inguinal ligament Pectineal ligament Lacunar ligament Reflected ligament

Posterior

Muscle	quadratus lumborum Iliopsoas psoas major psoas minor iliacus

Fascia	Iliac fascia Iliopectineal arch

Pelvis

Muscle	levator ani iliococcygeus pubococcygeus puborectalis coccygeus rectococcygeus

Fascia	pelvic fascia Visceral Rectovaginal fascia Rectoprostatic fascia Parietal Obturator fascia Tendinous arch Piriformis fascia floor superior fascia Pubovesical ligament Puboprostatic ligament inferior fascia Anococcygeal body

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