Fig. 6.

a: The type of PWIC is aponeurosis formed by the fusion of TAM and AIOMA. b: The type of PWIC is TAM and TAA. c: The type of PWIC is IOMA and AIOMA. d: The type of PWIC is IOMA and TAM

In autopsy, we found that in the inguinal region according to the anatomical level layer by layer free abdominal wall flat muscle and its tendon membrane (abdominal wall three flat muscle tendon attachment points: EOMA, IOMA, TAM), we can find in the abdominal wall, three types of flat muscle surface and dorsal surface are found in the thin fascial tissue, continued to the stopping point of the muscle in the anterior abdominal wall (the stopping point of the internal oblique and abdominal muscle in the bilateral inguinal area of some cadavers can be extended to the pubic symphysis), the fusion of a single layer of tenosynovial-like structure is relatively tough and dense, which is the fusion of AIOMA and TAA, at this time, the AIOMA and TAA form a dense fusion to form the posterior wall of the inguinal canal together, we can find a thin layer of fascial organization along the umbilicus. At this time, we can see Inferior abdominal artery running along the medial umbilical fold, and along the Inferior abdominal artery, a layer of thin transverse fascia with a yellow fat layer was bluntly detached, and we regarded this layer of fat above the transverse fascia as extraperitoneal fat, TF was a layer of membranous tissue located in the deeper layer of the TAM and the tendon membrane (behind the posterior sheath of the rectus abdominis), and there were Inferior abdominal artery and Corona Mortis passing through it between the TF and the TAM. (Fig. 7a)

In male cadaveric specimens, the spermatic cord was pierced out from the internal ring, and the sparse connective tissue between the AIOMA and the spermatic cord was easy to separate, no blood vessels and nerves were seen, (Fig. 7b.c), the spermatic cord was anchored by tough fibrous connective tissues located underneath it to the inguinal ligament, and by pulling up the spermatic cord, it could be seen that some muscle fibers of the cremaster on the surface of the spermatic cord were continued to the lateral side of the inguinal canal. And continued and fused with muscle fibers from IOMA and TAM, the relationship between the tissues is close, can not be separated; (Fig. 7d) Under the spermatic cord can be observed below the tough connective tissue connecting spermatic cord will be divided into two spaces, The spermatic cord is not “free” in the inguinal canal until the tough fibrous connective tissue beneath the spermatic cord is sharply separated