Semilunar line

Dr Craig Hacking et al.

The semilunar line, linea semilunaris or Spigelian line is a bilateral vertical curved line in the anterior abdominal wall where the layers of the rectus sheath fuse lateral to the rectus abdominis muscle and medial to the oblique muscles.

Related pathology

It is the site of a Spigelian hernia.

Anatomy: Abdominopelvic
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Article information

rID: 38680
Section: Anatomy
Tag: refs, cases
Synonyms or Alternate Spellings:
  • Linea semilunaris
  • Spigelian line

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Cases and figures

  • Figure 1: 3D VR non-contrast
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  • Rectus sheath (diagram)
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  • Rectus sheath (diagram)
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