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The linea semilunaris (also semilunar line or Spigelian line) is described by Adriaan van den Spiegel (°1578 †1625) described the Linea Semilunaris as the line forming and marking the transition from muscle to aponeurosis in the transversus abdominis muscle of the abdomen. It needs to be distinguished from the lateral border of the rectus ...
A Spigelian hernia is the type of ventral hernia that occurs through the Spigelian aponeurosis, which is the part of the aponeurosis of the transverse abdominal muscle bounded by the linea semilunaris (or Spigelian line) laterally and the lateral edge of the rectus abdominis muscle medially.
The arcuate line of rectus sheath (the arcuate line or the semicircular line of Douglas) is a line of demarcation [1] corresponding to the free inferior margin of the posterior layer of the rectus sheath [2] inferior to which only the anterior layer of the rectus sheath is present [3] and the rectus abdominis muscle is therefore in direct contact with the transversalis fascia. [1]
The aponeurosis of the abdominal external oblique muscle is a thin but strong membranous structure, the fibers of which are directed downward and medially.. It is joined with that of the opposite muscle along the middle line, and covers the whole of the front of the abdomen; above, it is covered by and gives origin to the lower fibers of the pectoralis major; below, its fibers are closely ...
Since the tendons of the internal oblique and transversus abdominis only reach as high as the costal margin, it follows that above this level the sheath of the rectus is deficient behind, the muscle resting directly on the cartilages of the ribs, and being covered only by the tendons of the external obliques.
An extremely well defined abdominal section can appear to be an "eight pack", as all eight sections of the abdominal muscle become defined. This definition is prominent among athletes with low percentages of body fat, such as bodybuilders, boxers, mixed martial artists, rock climbers, and track and field athletes.
Linea aspera, ridge of roughened surface on the posterior aspect of the femur; Linea nigra, dark vertical line that appears on the abdomen during pregnancy; Linea semilunaris, curved tendinous line placed one on either side of the rectus abdominis. Linea terminalis or innominate line, consists of the pectineal line, the pubic crest and the ...
The iliopectineal line is the border of the iliopubic eminence. [1] It can be defined as a compound structure of the arcuate line (from the ilium) and pectineal line (from the pubis).