Linea semilunaris

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

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
TA98	A04.5.01.025
TA2	2380
FMA	19929
Anatomical terminology

Structure

The linea semilunaris corresponds with the lateral border of the rectus abdominis muscle.[1][2] It extends from the cartilage of the ninth rib to the pubic tubercle. It is formed by the aponeurosis of the internal oblique at its line of division to enclose the rectus. This is reinforced anteriorly by the external oblique, and posteriorly by the transversus abdominis above the arcuate line.[1]

Clinical significance

A hernia through the linea semilunaris is called a Spigelian hernia.[3][4] This usually occurs at the meeting point of the linea semilunaris with the arcuate line and the lateral border of the rectus abdominis muscle.[3]

Reference

1. Reuben, Brian; Vargo, Daniel; Massey, Marga F. (2009-01-01), Evans, Stephen R. T. (ed.), "Chapter 55 - Component Separation for Complex Abdominal Wall Reconstruction and Recurrent Ventral Hernia Repair", Surgical Pitfalls, Philadelphia: W.B. Saunders, pp. 545–569, doi:10.1016/b978-141602951-9.50069-4, ISBN 978-1-4160-2951-9, retrieved 2021-01-26
2. Ahmed, Abdul (2017-01-01), Brennan, Peter A.; Schliephake, Henning; Ghali, G. E.; Cascarini, Luke (eds.), "37 - Common Free Vascularized Flaps: The Rectus Abdominis", Maxillofacial Surgery (Third Edition), Churchill Livingstone, pp. 533–542, ISBN 978-0-7020-6056-4, retrieved 2021-01-26
3. Weber, Thomas R. (2010-01-01), Holcomb, George Whitfield; Murphy, J. Patrick; Ostlie, Daniel J. (eds.), "chapter 49 - UMBILICAL AND OTHER ABDOMINAL WALL HERNIAS", Ashcraft's Pediatric Surgery (Fifth Edition), Philadelphia: W.B. Saunders, pp. 637–640, ISBN 978-1-4160-6127-4, retrieved 2021-01-26
4. Pegoli, Walter; Drugas, George T. (2007-01-01), Garfunkel, Lynn C.; Kaczorowski, Jeffrey M.; Christy, Cynthia (eds.), "Hernias, Abdominal Wall", Pediatric Clinical Advisor (Second Edition), Philadelphia: Mosby, pp. 264–265, ISBN 978-0-323-03506-4, retrieved 2021-01-26

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"