To view internal organs and understand their anatomy it is often helpful to cut or section them. There are three primary ways that an organ or the body can be cut to view its internal structure (Figure 1.3). A sagittal section is a cut which divides the body or organ into right and left portions. A special kind of sagittal section is a cut which passes through the imaginary midline of the body or organ. This cut is termed a midsagittal section. A frontal section is one which divides the structure into anterior and posterior parts (as if one had cut the "front all" off). Finally a transverse or cross section is a cut perpendicular to the midline dividing the body or organ into superior and inferior portions.
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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.