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Lateral muscles of the abdominal ...
In the abdomen the segments of the embryonic wall fuse during development to form the large, thick sheets of muscle that define the unsegmented lateral muscle layers. The tendinous aponeuroses of the three-layered lateral wall of the abdomen continue toward the anterior midline to encircle the rectus abdominis and form the midline tendinous intersection called the linea alba. This strong fibrous covering of the rectus abdominus is called the rectus sheath. In the lower anterolateral abdominal wall, between the anterior iliac spine and pubic tubercle, the inferior border of the aponeuroses forms the stout cord-like inguinal ligament. Inferomedially, an inherent weak spot in the wall, the superficial inguinal ring is the opening of the inguinal canal just superior to the inguinal ligament. This canal provides passage for the vessels, nerves, and spermatic ducts entering and leaving the male testis and the round ligament of the female. In the male a tubular prolongation of the musculotendinous wall forms the sheaths of the spermatic cord. Posteriorly, the muscular wall is strong as its three lateral layers attach to the vertebral column and ribs via strong aponeuroses.
External oblique, Internal oblique, Quadratus lumborum, and the Transerversus abdominis