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The rectus sheath is formed by the aponeuroses of the transversus abdominis and the external and internal oblique muscles. It contains the rectus abdominis and pyramidalis muscles. It can be divided into anterior and posterior laminae. The arrangement of the layers has important variations at different locations in the body. ==Below the costal margin== For context, above the sheath are the following two layers: # Camper's fascia (anterior part of the Superficial fascia) # Scarpa's fascia (posterior part of the Superficial fascia) Within the sheath, the layers vary: Below the sheath are the following three layers: # transversalis fascia # extraperitoneal fat # parietal peritoneum The rectus, in the situation where its sheath is deficient below, is separated from the peritoneum only by the transversalis fascia, in contrast to the upper layers, where part of the internal oblique also runs beneath the rectus. Because of the thinner layers below, this region is more susceptible to herniation. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rectus sheath」の詳細全文を読む スポンサード リンク
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