Fig. 3

Transverse ultrasonographic image of a dog’s stomach (a) and corresponding histologic section with Masson’s trichrome stain (b) from the retrospective study. The gastric muscularis UHS were more prominent in the contracted portion of the stomach where the muscularis was thicker. In the histologic section, the fibrous tissue (blue) in the thicker part of the muscularis is mostly perivascular (see insertion at the right bottom corner), whereas in the thinner part, the blue-stained fibrous tissue is in the muscularis interstitium parallel to the muscle fibers and to the serosal surface (top). The double-headed arrow spans the muscularis. M gastric mucosa, SM gastric submucosa