Abstract
The ultrastructure of the dog testicular interstitial cells is described. The cells are characterized by numerous tubules of agranular endoplasmic reticulum, many large lipid droplets, different types of dense bodies including heterogeneously dense bodies, giant mitochondria containing lipid droplets, a few microtubules, and well-developed cytoplasmic filaments and their specific organization. Acid phosphatase reaction at ultrastructural level reveals that some of the lipid droplets change into the heterogeneously dense bodies, lysosomes. The cytoplasmic filaments are occasionally arranged in large bundles piled closely in an extensive area adjacent to the Golgi region in the cytoplasm. Some of these large bundles show conspicuous circular or spiral configurations which are composed of elaborate arrangements of both circular and longitudinal filaments and accompany tubules of agranular endoplasmic reticulum running parallel to the longitudinal filaments.
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