A computer program (SECTION) is presented which allows for the three‐dimensional reconstruction of serial cross sections through biological materials. The program provides a numerical analysis of perimeter length and transverse area of each anatomical feature designated in a cross section, as well as surface area and volume computations for features that pass from one section to another. In addition to rotating and tilting the 3‐D reconstruction in any desired orientation, the program has editing capabilities which allow different combinations of anatomical features to be shown in neutral gray outline or interconnected by colored lines.

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