Arcuate line of rectus sheath


Arcuate line of rectus sheath
Arcuate line of rectus sheath
Gray398.png
The interfoveolar ligament, seen from in front. (Linea semicircularis labeled at center top.)
Latin linea arcuata vaginae musculi recti abdominis
Gray's subject #118 416

The arcuate line of the abdomen, Linea semicircularis or Douglas' line is a horizontal line that demarcates the lower limit of the posterior layer of the rectus sheath. It is also where the inferior epigastric vessels perforate the rectus abdominus.

Superior to the arcuate line, the internal oblique aponeurosis splits to envelope the rectus abdominis muscle. Inferior to the arcuate line, the internal oblique and transversus abdominis aponeuroses merge and pass superficial (i.e. anteriorly) to the rectus muscle.

The arcuate line occurs about 1/3 of the distance from the umbilicus to the pubic crest, but this varies from person to person. Above the arcuate line, the rectus abdominis is surrounded by an anterior layer of the rectus sheath and a posterior layer. The anterior layer is derived from the external oblique aponeurosis and the anterior lamina of the internal oblique aponeurosis. The posterior layer is made up of the posterior lamina of the internal oblique aponeurosis and the tranverse abdominal aponeurosis. Inferior to the arcuate line, all three muscle aponeuroses make up the rectus sheath, that is now only anterior to the rectus abdominis and not posterior to it at all.

Therefore, inferior to the arcuate line, the rectus abdominis rests directly on the transversalis fascia.

If one dissects the anterolateral abdominal wall, the arcuate line may be difficult to see, since all the aponeuroses are translucent.

External links


Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Rectus sheath — Infobox Anatomy Name = PAGENAME Latin = vagina musculi recti abdominis GraySubject = 118 GrayPage = 416 Caption = Caption2 = System = MeshName = MeshNumber = DorlandsPre = v 01 DorlandsSuf = 12842658 The Rectus sheath is formed by the aponeuroses …   Wikipedia

  • Arcuate line (anterior abdominal wall) — Infobox Anatomy Name = PAGENAME Latin = linea arcuata vaginae musculi recti abdominis GraySubject = 118 GrayPage = 416 Caption = The interfoveolar ligament, seen from in front. (Linea semicircularis labeled at center top.) Caption2 = System =… …   Wikipedia

  • arcuate line of sheath of rectus abdominis muscle — linea arcuata vaginae musculi recti abdominis …   Medical dictionary

  • line — 1. A mark, strip, or streak. In anatomy, a long, narrow mark, strip, or streak distinguished from the adjacent tissues by color, texture, or elevation. SEE ALSO: linea. 2. A unit of …   Medical dictionary

  • Rectus abdominis muscle — Rectus abdominis The human rectus abdominis muscle. Latin musculus rectus abdominis Gray s …   Wikipedia

  • sheath — 1. Any enveloping structure, such as the membranous covering of a muscle, nerve, or blood vessel. Any sheathlike structure. SYN: vagina (1). 2. The prepuce of male animals, especially of the horse. 3. A specially designed tu …   Medical dictionary

  • linea — SYN: line. [L.] l. alba [TA] a fibrous band running vertically the entire length of the midline of the anterior abdominal wall, receiving the attachments of the oblique and transverse abdominal …   Medical dictionary

  • James Douglas (physician) — Dr James Douglas (March 21, 1675 April 2, 1742), was a Scottish physician and anatomist, member of the Royal Society, and physician to the Queen. Brother of well known lithotomist John Douglas (died 1759), James Douglas was born in West Calder,… …   Wikipedia

  • Мышцы живота — По месту расположения мышцы живота (mm. abdominis) делятся на группы мышц передней, боковой и задней стенок живота. Мышцы передней стенки животаМышцы боковой стенки животаМышцы задней стенки животаФасции живот …   Атлас анатомии человека

  • List of anatomical topics — This page aims to list articles related to anatomy. This list is not necessarily complete or up to date if you see an article that should be here but isn t (or one that shouldn t be here but is), please update the page accordingly. NOTOC A… …   Wikipedia