Fig. 17. Ultrastructure of human hyalocytes. A mononuclear cell is seen embedded within the dense collagen fibril (black C) network of the vitreous cortex. There is a lobulated nucleus (N) with dense marginal chromatin (white C). In the cytoplasm there are mitochondria (M), dense granules (arrows), vacuoles (V), and microvilli (Mi) (×1670). (Courtesy of JL Craft and DM Albert, Harvard Medical School, Boston; Sebag J: The Vitreous--Structure, Function and Pathobiology. New York, Springer-Verlag, 1989)