Figure 4.

A representative dextran-biotin labeled sling muscle IMA. In the center, a Photoshop tracing of the IMA terminal arbor illustrates the incoming parent fiber that bifurcates and branches repeatedly to produce a terminal field of long processes that run in and parallel to sling muscle fibers (not stained). Panels A through C are high power all-in-focus photomicrographs of neurites in the terminal of the traced ending, taken at the locations in the tracing designated by the corresponding letters. The tracing scale bar = 125 μm; the scale bar in Panel C = 20 μm for all three photomicrographs.