World Library  
Flag as Inappropriate
Email this Article

Rectus sheath

Article Id: WHEBN0007741213
Reproduction Date:

Title: Rectus sheath  
Author: World Heritage Encyclopedia
Language: English
Subject: Arcuate line of rectus sheath, Fascia, Corrugator cutis ani muscle, Sheath, Fascia of Camper
Collection:
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Rectus sheath

Rectus sheath
Details
Latin vagina musculi recti abdominis
Anatomical terminology

The rectus sheath is formed by the aponeuroses of the transversus abdominis and the external and internal oblique muscles. It contains the rectus abdominis and pyramidalis muscles.

It can be divided into anterior and posterior laminae.

The arrangement of the layers has important variations at different locations in the body.

Contents

  • Below the costal margin 1
  • Above the costal margin 2
  • Additional images 3
  • References 4
  • External links 5

Below the costal margin

For context, above the sheath are the following two layers:

  1. Camper's fascia (anterior part of the Superficial fascia)
  2. Scarpa's fascia (posterior part of the Superficial fascia)

Within the sheath, the layers vary:

Region Illustration Description
Above the arcuate line At the lateral margin of the rectus, the aponeurosis of the internal oblique divides into two lamellae:
  • one of which passes in front of the rectus, blending with the aponeurosis of the external oblique as well as the aponeurosis of the anterior half of the internal oblique.
  • the other, behind it, blending with the aponeurosis of the transversus as well as the posterior half of the internal oblique, and these, joining again at the medial border of the rectus, are inserted into the linea alba.
Below the arcuate line Below this level, the aponeuroses of all three muscles (including the transversus) pass in front of the rectus.

Below the sheath are the following three layers:

  1. transversalis fascia
  2. extraperitoneal fat
  3. parietal peritoneum

The rectus, in the situation where its sheath is deficient below, is separated from the peritoneum only by the transversalis fascia, in contrast to the upper layers, where part of the internal oblique also runs beneath the rectus. Because of the thinner layers below, this region is more susceptible to herniation.

Above the costal margin

Since the tendons of the internal oblique and transversus abdominus only reach as high as the costal margin, it follows that above this level the sheath of the rectus is deficient behind, the muscle resting directly on the cartilages of the ribs, and being covered only by the tendons of the external obliques.

Additional images

References

This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

External links

  • Anatomy figure: 35:04-02 at Human Anatomy Online, SUNY Downstate Medical Center - "Incisions and the contents of the rectus sheath."
  • Anatomy photo:35:10-0103 at the SUNY Downstate Medical Center - "Anterior Abdominal Wall: The Rectus Abdominis Muscle"
  • Anatomy image:7180 at the SUNY Downstate Medical Center - anterior layer
  • Anatomy image:7133 at the SUNY Downstate Medical Center - posterior layer above arcuate line
  • Anatomy image:7574 at the SUNY Downstate Medical Center - posterior layer above arcuate line
  • 174784590 at GPnotebook
  • rectussheath at The Anatomy Lesson by Wesley Norman (Georgetown University)
  • Atlas image: abdo_wall60 at the University of Michigan Health System - "The Rectus Sheath, Anterior View & Transverse Section"


This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.