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Serous Demilunes
The secretory unit in the center of the field is composed totally of mucous-secreting cells (A) forming a mucous acinus. Note the position of the nuclei in the cells (basal) as well as their shape (flattened). The apical border of each cell opens into the lumen of the acinus (B). The mucous acinus on the upper left has a large serous demilune (C) covering its lower left outer boundary. Demilunes are always composed of serous cells. In the mucous secretory unit just to the lower left of center, note a triangular shaped nucleus lying between the base of the junction of two mucous cells and the basement membrane. This nucleus belongs to a myoepithelial cell (D).
Legend
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A - mucous secretory cell |
C - serous demilune |
