External abdominal oblique aponeurosis
The superficial inguinal ring is a slit-like opening between the diagonal fibers of the external abdominal oblique. It is bounded by the medial and lateral crus, and it forms the exit of the inguinal canal. The falx inguinalis is composed of arching fibers of the internal abdominal oblique and the transversus abdominis. It forms the roof of the inguial canal, and the posterior wall medially where it inserts as the conjoint tendon (onto the pubic crest and medial part of the pectineal ligament. Scarpa's fascia is the membranous layer of subcutaneous fascia. Finally, transversalis fascia is found laterally on the posterior wall of the inguinal canal, forming the area of weak fascia in that wall.