Here, both Spigelian and exceedingly rare arcuate line hernias may occur.
2.
Superior to the arcuate line, the internal oblique aponeurosis splits to envelop the rectus abdominis muscle both anteriorly and posteriorly.
3.
It originates just medial to the deep inguinal ring to the arcuate line on the posterior surface of the anterior abdominal wall.
4.
Above the arcuate line, the rectus abdominis is surrounded by an anterior layer of the rectus sheath and a posterior layer.
5.
Basal and columellar margins are forming one strongly arcuate line joined above to the extremity of the labrum by a thickish callosity.
6.
The arcuate line occurs about 1 / 2 of the distance from the umbilicus to the pubic crest, but this varies from person to person.
7.
Inferior to the arcuate line, the internal oblique and transversus abdominis aponeuroses merge and pass superficial ( i . e . anteriorly ) to the rectus muscle.
8.
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.
9.
The fossa gives origin to the Iliacus muscle and is perforated at its inner part by a nutrient canal; below this there is a smooth, rounded border, the arcuate line, which runs anterior, inferior, and medial.
10.
The arcuate line must be incised at its lateral-most point in order to enter the space of Retzius and Bogros from within the rectus sheath to carry out the caudal portion of dissection during retrorectus repair and transversus abdominis release.
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