Traced neurons observed in studied sections.

<p>(<b>a, b, c, d</b>) Microphotographs presenting the Fast Blue positive neurons (arrows) in section I (<b>a, b</b>), II (<b>c</b>) and III (<b>d</b>) obtained from the stomachs of control animals. In section I the traced neurons occurred mostly in groups of 4–7 neurons (<b>a</b>), although there were more numerous clusters, up to 12 cells observed (<b>b</b>). In section II the traced cells were observed in groups up to 5 neurons (<b>c</b>), while in section III only occasional cells were noticed (<b>d</b>). There were no traced neurons observed within section IV. (<b>e, f, g</b>) Photomicrographs showing the Fast Blue positive neurons (arrows) in section I (<b>e, f</b>), and II (<b>g</b>) obtained from the stomachs of experimental animals. In section I the majority of labeled cells was scattered within the myenteric ganglia singly or in pairs (<b>e</b>), however, occasional groups up to 4 labeled neurons were additionally noticed (<b>f</b>). In section II the traced cells were observed mostly singly (<b>g</b>). There were no labeled neurons observed within section III nor IV. (<b>h, i, j</b>) Higher magnification microphotographs showing the Fast Blue labeled perikarya (arrows) of different sizes and shapes: (<b>h</b>) medium-sized oval (single arrow) and round (double arrow), (<b>i</b>) small-sized round and (<b>j</b>) large-sized triangular in shape labeled perikarya.