Turbellarian taxonomic database

Record # 10300
Hyman LH (1946)
The nature of the eosinophilous spheres in the intestinal epithelium of planarians. A correction.
Transact Amer Microsc Soc 65:276-277

Abstract / Notes

The eosinophilous spheres seen in the intestinal epithelium of planarians are not zymogen granules. Their size
and number depend on the length of time elapsed since feeding. The larger balls seen within 3-4 days after
feeding are protein food balls in the final stages of digestion. The small spheres occurring in clusters in
club-shaped cells are protein reserve. The digestive enzymes of planarians are secreted by the ordinary
epithelial cells of the intestine and have no visible precursors in these cells.

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