The retroperitoneum is variably defined, mostly by the lack of consensus definition for the posterior abdominal and whether the psoas muscles and quadratus lumborum are boundaries or contents 4. The boundary is there for a reason, so crossing it is significant in either direction. If you play a sport you are familiar with the term in bounds, which refers to the boundary, or limits of the. In either case, it usually means that the person crossing the boundary is doing something unexpected and they probably shouldnt be doing it. ![]() The retroperitoneum is the part of the abdominal cavity that lies between the posterior parietal peritoneum anteriorly and the posterior abdominal wall 4. It is C-shaped on axial cross-section with convexity projecting anteriorly in the mid-line. boundary noun C uk / ban.d r.i / us / ban.d r. 1) Crossing the boundary of something can mean either direction: into or out of.
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