Figure 2-17: Tomographic sections of the heart in the transverse (A) and frontal (B) planes of the body. A tomographic section in the transverse plane of the body (A) results in a four-chamber view of the heart. A tomographic section along the frontal plane of the body (B) results in an oblique short-axis view of the heart. C. MRI image corresponding to A. CS, coronary sinus; DAo, descending thoracic aorta; IVC, inferior vena cava; LA, left atrium; LAD, left anterior descending coronary artery; LV, left ventricle; RA, right atrium; RCA, right coronary artery; RV, right ventricle; RVO, right ventricular outflow; TV, tricuspid valve; VS, ventricular septum.
Pathologic lesions in both congenital and acquired heart diseases often involve contiguous chambers, valves, or vessels. The tomographic method is the optimal technique for demonstrating intracardiac relationships and is ideal for any disease that involves several cardiac chambers. The proliferation of noninvasive tomographic imaging techniques makes this method particularly ideal for clinicopathologic correlations.
Limitations of tomographic dissection can be overcome by photography, computer imagery, and interestingly, the use of glue. After each tomographic section has been produced and photographed, the bisected specimens can be glued back together using any cyanoacrylate glue such as Krazy Glue or Superglue and resectioned along a different tomographic plane.6 A step-by-step photographic documentation is necessary, since once the specimen has been glued and recut, the preceding tomographic plane of section will be available only in the photograph and not in the actual specimen.
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.