Answer to The Abdominals of Dorian Greyish
Correct answer is C. Spigelian hernia occurs through slit like defect in the anterior abdominal wall adjacent to the semilunar line. The linea semilunaris is a vertical, curved structure that runs along the lateral edges of the rectus abdominis muscle in the anterior abdominal wall. It is the site of union where tendons of the lateral abdominal muscles meet the sheath surrounding the rectus abdominis muscle, also known as the rectus sheath. Most of spigelian hernias occur in the lower abdomen where the posterior sheath is deficient. The hernia ring is a well-defined defect in the transverses aponeurosis. While this may seem a bit clinical for first year students, the question is design to focus attention on recognizing the location of the semilunar line, a visible surface anatomy structure in individuals with a well defined rectus abdominis.
Answer to this question is based on material presented in lectures 2 of the Abdomen Lecture Series.
= Linea alba
= Tendinous intersection
= Semilunar line
= Tendinous intersection
= Inguinal ligament