Gastric glands, a. This photomicrograph shows the fundic mucosa from an Alcian blue/PAS preparation to visualize mucus. Note that the surface epithelium invaginates to form the gastric pits. The surface mucous cells and the cells lining the gastric pits are readily identified in this preparation because the neutral mucus within these cells is stained intensely. One of the gastric pits and its associated fundic gland are depicted by the dashed lines. This gland represents a simple branched tubular gland (arrows indicate the branching pattern). It extends from the bottom of the gastric pit to the muscularis mucosae. Note the segments of the gland: the short isthmus, the site of cell divisions; the relatively long neck; and a shorter and wider fundus. The mucous secretion of mucous neck
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