Just above the medial end of the inguinal ligament, identify the superficial inguinal ring . It is an opening in the aponeurosis of the external abdominal oblique muscle through which the spermatic cord of the male or the round ligament of the female passes to the scrotum or labia majora, respectively. Medial and lateral to the superficial inguinal ring, identify the medial crus and lateral crus, respectively. These crura are thickenings of the external abdominal oblique aponeurosis. Superior and lateral to the superficial inguinal ring, identify the intercrural fibers. These fibers reinforce the anterior abdominal wall in this region and help prevent the crura from pulling apart.
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