abdominal wall abdominal wall in anatomy, the abdominal wall represents the boundaries of the abdominal cavity. the abdominal wall is split into the anterolateral and posterior walls. abdominal wallbody cavitiesdiagram of sheath of rectus above the arcuate line.detailsidentifierslatinparies abdominalismeshd034861fma10429anatomical terminology there is a common set of layers covering and forming all the walls: the deepest being the visceral peritoneum, which covers many of the abdominal organs (most of the large and small intestines, for example), and the parietal peritoneum- which covers the visceral peritoneum below it, the extraperitoneal fat, the transversalis fascia, the internal and external oblique and transversus abdominis aponeurosis, and a layer of fascia, which has different names according to what it covers (e.g., transversalis, psoas fascia). in medical vernacular, the term 'abdominal wall' most commonly refers to the layers composing the anterior abdominal wall which, in addition to the layers mentioned above, includes the three layers of muscle: the transversus abdominis (transverse abdominal muscle), the internal (obliquus internus) and the external oblique (obliquus externus). structure the contour of abdominal wall is roughly hexagonal. its superior border is bounded by the coastal margins, lateral borders by mid-axillary lines, and inferior borders bounded by the anterior half of the iliac crest, inguinal ligaments, pubic crest, and pubic symphysis. layers in human anatomy, the layers of the anterolateral abdominal wall are (from superficial to deep): skin subcutaneous tissue fascia camper's fascia - fatty superficial layer. scarpa's fascia - deep fibrous layer. superficial abdominal fascia muscle external oblique abdominal muscle internal oblique abdominal muscle rectus abdominis transverse abdominal muscle pyramidalis muscle transversalis fascia extraperitoneal fat peritoneum inner surface the surface contains several ligaments separated by fossae: ligament/foldremnant oflateral fossahernia median umbilical ligamenturachussupravesical fossasupravesical hernia (rare) medial umbilical ligamentumbilical arterymedial inguinal fossadirect inguinal hernia lateral umbilical foldinferior epigastric vesselslateral inguinal fossaindirect inguinal hernia