Semilunar Line at Anatomy

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Semilunar Line. The semilunar line is defined as the transition of the transversus abdominis muscle to its aponeurotic tendon. This layer is comprised of aponeuroses located between the rectus abdominis medially and the semilunar line laterally.

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The hernial orifice of a spigelian hernia is located in the spigelian fascia, that is, between the lateral border of the rectus abdominis muscle and the semilunar line, through the transversus abdominis aponeurosis, close to the level of the arcuate line. A mark, strip, or streak. This prevents inversion of the heart valves.

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In anatomy, a long, narrow mark, strip, or streak distinguished from the adjacent tissues by color, texture, or elevation. It is called a line because, when plotted on a graph, it looks like a roughly horizontal line. Shenton's line a curved line seen in radiographs of the normal hip, formed by the top of the obturator foramen; Spigelian fascia is located between the semilunar line and the lateral edge of the rectus abdominis muscle.