Figure 4. Stationary contractions induced by decanoic acid in a segment of ileum.

The upper panel of A shows a spatiotemporal map of isolated duodenum during infusion of decanoic acid (1 mm). The square highlights a region containing two constrictions that are shown with greater magnification in the lower panel. Note, the constriction appeared simultaneously at all points and did not extend to other regions at later times, i.e. it did not propagate. B tracks the diameter at a single point (dashed line) through one constriction. C shows a pressure recording corresponding to the entire time period shown in A.