\Body region structure\Body part structure\Lower body structure (body structure)\Lower body part structure\This segment relates to the volume of the trunk that is bounded by and includes: superiorly thoracic diaphragm and inferiorly the perineum and external genitalia. The volume includes the entire transverse thickness of the body over the longitudinal extent between these upper (superior) and lower (inferior) boundaries including the overlying muscles, skin and subcutaneous tissue. The segment includes the abdominopelvic cavity, contents and wall including the posterior lumbar region, the volume of the true and false pelvic cavities including the bony pelvis and pelvic wall, the entire perineum and external genitalia including skin and subcutaneous tissue.\This segment relates to the volume of the trunk that is bounded superiorly by and includes: superiorly the boundary of the false pelvis, which is an artificial plane from the symphysi udes the entire transverse thickness of the body over the longitudinal extent between the superior (upper) and inferior (lower) boundaries including the skin and subcutaneous tissue. The segment relates to the cross-sectional or projectional volume as perceived by transmissive or emissive imaging.\This structure, also termed the pelvic region, includes the wall, cavity and content of both the true and false pelvis; it consequently incorporates the entire bony pelvis; and inferiorly it is bounded and includes the pelvic diaphragm. The structure incorporates the complete pelvic wall; sacrococcygeal region (including the overlying skin and subcutaneous tissue); the contents of the false pelvic cavity; but in contrast to the 'pelvic segment of trunk' excludes the perineum, external genitalia.\Structure of cavity and/or content of pelvis (body structure)\This structure comprises the space and content within the boundaries of the cavity of the true pelvis (also known as the cavity of the minor or lesser pelvis) but excludes the walls that define and enclose the space. Previously SNOMED CT used the word 'compartment' to describe structures comprising the cavity and content but FMA has used the same word to include cavity, content and wall. As a consequence, the preferred notation is intra-abdominopelvic structure as this more clearly excludes the 'wall' structures. The intra-pelvic structure is bounded by, but excludes the following 'wall' structures: superiorly the superior pelvic aperture; inferiorly the inferior aperture of true pelvis and pelvic diaphragm; and laterally the pelvic wall. Note, the structures that form the boundaries are excluded. The content includes the urinary bladder, sigmoid colon (although it is acknowledged that this is mobile and sits in a variable location), rectum, anal canal, /snomed/554471000005108-20250331/?type=snomed&id=116680003">Is a
Fibrous sheath of prostate |
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This concept is not in any reference sets
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