. The Biological bulletin. Biology; Zoology; Marine biology. 12 10HX MAXWELL AXDERSOX. Figure 17. Section of the wall of a side branch of a fold-pattern in the roof of the pyloric stomach. The top of the fold or inverted gutter lies to the right (alcian blue. Harris). Note the relative simplicity of the epithelium, here consisting mainly of typical cells, with brightly staining, alcian blue-positive distal granules, and conspicuously long flagella. In many similar areas basal cells are much more numerous than in this section. Scale bar = 20 /tm. Figure 18. Thin section of the top of a fold in
. The Biological bulletin. Biology; Zoology; Marine biology. 12 10HX MAXWELL AXDERSOX. Figure 17. Section of the wall of a side branch of a fold-pattern in the roof of the pyloric stomach. The top of the fold or inverted gutter lies to the right (alcian blue. Harris). Note the relative simplicity of the epithelium, here consisting mainly of typical cells, with brightly staining, alcian blue-positive distal granules, and conspicuously long flagella. In many similar areas basal cells are much more numerous than in this section. Scale bar = 20 /tm. Figure 18. Thin section of the top of a fold in one of the sets of patterns in the roof of the pyloric stomach (Harris's hematoxylin, acid fuchsin). The abundance of granular basal cells is striking; beyond the thick connective-tissue layer, with its hemal channels, is a char- acteristic accumulation of granule-filled peritoneal cells (arrow). Scale bar = 20 /an. Figure 19. Section showing inward extensions of glandular epithelium on downhanging folds between the inverted gutters in the roof of the pyloric stomach (dilute aqueous toluidine blue). Strong metachromatic staining is seen in the mucous gland cells, and in the distal granules of typical cells (compare Figure 17). Orthochromatic globule cells lie among the mucous gland cells. Scale bar = 40 /an. Figure 20. Section near the midline of the main channel of a fold pattern; this channel leads directly toward the opening into the intestine (thin section, methylene blue and eosin). Columnar arrays of granule-filled basal cells occupy almost the entire thickness of the lining epithelium, as in the floor of Tiedemann's duct (compare Fig. 1). The nerve layer and connective-tissue layer are thick, and die longitudinal muscle layer (arrow) is much better developed here than elsewhere in the gut. Granule-filled peritoneal cells become much more numerous just at the midline of this main channel. Scale bar = 40 jum. A type of epithelium very similar to that just described covers
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectb, booksubjectzoology
