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Semilunar line

Last revised by Assoc Prof Craig Hacking on 10 Apr 2019

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.

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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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