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. Author manuscript; available in PMC: 2020 Sep 4.
Published in final edited form as: Cell Tissue Res. 2019 Sep 4;377(3):527–547. doi: 10.1007/s00441-019-03096-6

Figure 3.

Figure 3

Structural aspects of enteric phagocytes. a, b Drawing of planarian enteric phagocyte (a) and invertebrate macrophages (b) phagocytosing erythrocytes (rendered in brown; from Metschnikoff, 1884). (C) Light microscopic appearance of epithelium of mollusk digestive gland, containing enteric phagocytes (left), glandular cells (right; from Millot, 1937, with permission). Terms used by author (“ingested body”, “discrete vacuole”, “irregular vacuole”, “fatty body” likely correspond to phagosome, phagolysosome, and lipid body, respectively. (d, e) Electron micrograph (e) and schematic drawing (d) of molluscan enteric phagocyte (from Owen 1972, with permission). Organelles of the phagosome/lysosome system, depicted in e, are pointed out by blue arrows in d. Abbreviations: BC pyramidal basophilic cell (=zymogenic gland cell); DC digestive cell (=enteric phagocyte); Ga Golgi apparatus; ger granular endoplasmic reticulum; Gv Golgi vesicle; hl heterolysosome (=phagolysosome); hp heterophagosome (=phagosome); lu lumen of tubule; m microvilli; n nucleus; p pinosome (=primary endocytic vesicle); rb residual body; sv secretory vesicle.