These cells are organized into acini that connect to intercalated ducts, which then merge to form larger excretory ducts.

Ultrastructure

Under electron microscopy, serous acinar cells reveal:
* Abundant rough endoplasmic reticulum arranged in parallel cisternae
* Numerous free ribosomes
* Large, electron-dense secretory granules containing inactive digestive enzymes
* Extensive lateral interdigitations between adjacent cells
* Well-developed golgi complexes
* Mitochondria concentrated in the basal

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