Arcuate line

The arcuate line or semicircular line of Douglas is located at roughly one-third of the distance from the pubic crest to the umbilicus. It is the demarcation where the internal oblique and transversus abdominis aponeuroses of the rectus sheath start to pass anteriorly to the rectus abdominis muscle, leaving only the transversalis fascia posteriorly.

Superior to the arcuate line, the aponeurosis of external oblique passes anterior to rectus abdominis, the aponeurosis of internal oblique splits around the rectus abdominis and the aponeurosis of transversus abdominis and transversalis fascia pass posteriorly. The inferior epigastric arteries enter the rectus sheath at the arcuate line.

Anatomy: Abdominopelvic

Anatomy: Abdominopelvic

Article information

rID: 47218
Section: Anatomy
Tag: refs, cases
Synonyms or Alternate Spellings:
  • semicircular line of Douglas
  • semicircular line

ADVERTISEMENT: Supporters see fewers/no ads

Cases and figures

  • Rectus sheath (diagram)
    Drag here to reorder.
  • Rectus sheath (diagram)
    Drag here to reorder.
  • Updating… Please wait.

     Unable to process the form. Check for errors and try again.

     Thank you for updating your details.