The bright pink line to the right is a thin connective tissue interlobular septum. In the middle is a dark, serous demilune capping a mucous acinus. Mixed salivary gland stained with Mallory to show the bright blue areolar connective tissue stroma that supports the acini and carries capillaries and nerves. The finest fibers would be reticular. The acinar cells, both mucous and serous, constitute the parenchyma of the gland.
Mucous acini are white.
Slide 26 High magnification of mucous acinus with small lumen in the center. In the serous acini occupying most of the rest of the field, red zymogen granules are distinct. Pancreas Slide 27 Panoramic view of pancreas showing the same kind of lobular structure seen in the salivary gland. Note interlobular vessels in the connective tissue septa. Another view of pancreas, with thin connective tissue septa dividing the parenchyma into lobules of secretory acini.