Relationship of serous-secreting cells and mucous-secreting cells in the mixed acinus, a. This drawing indicates the relationship of the mucous and serous cells as observed in the electron microscope following the rapid freezing method. The serous cells extend from the basal lamina to the lumen of the acinus, b. In this drawing, serous cells are shown occupying the periphery of the acinus to form the so-called serous demilune. This feature is visible in routine preparations using immersion fixation. The swollen mucous cells have forced out the serous cells, leaving small remnants of the cytoplasm between the mucous cells.
mucous cell serous cell
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