Weak factors in inguinal region
1. From the perspective of occurrence, the decline of testis left a potential gap, namely the inguinal canal, so the incidence of inguinal hernia in men was significantly higher than that in women.
2. From the structural point of view, the external oblique muscle of abdomen moves to the aponeurosis of inguinal region, forming a shallow ring of inguinal canal, which leads to the decrease of abdominal wall tension. The lower edges of the internal oblique muscle and transverse abdominal muscle are arched, and there is no muscle covering between them and inguinal ligament.
3. Physiologically, the abdominal pressure when people stand upright is 3 times higher than when they lie on their backs, so the particularity of human standing upright increases the incidence of hernia.
Extended data
The inguinal region is a special area of anterolateral abdominal wall, which connects the abdomen, pelvis and lower limbs, and its anatomical level is basically the same as that of anterolateral abdominal wall.
Anatomically, the inguinal region is located in the lower part of the anterior abdominal wall, which is triangular, with one left and one right. The upper boundary is from the anterior superior iliac spine to the outer edge of rectus abdominis, and the lower boundary is inguinal ligament.
Like other parts of the anterior abdominal wall, the abdominal wall in the inguinal region is divided into seven layers from shallow to deep: skin, superficial fascia (Camper fascia), deep fascia (Scarpa fascia), muscular layer (external oblique muscle, internal oblique muscle, transverse abdominal muscle and its aponeurosis), transverse abdominal fascia, extraperitoneal fascia (extraperitoneal fat) and peritoneum (parietal layer).
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