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Ultrastructure features of epitenon. Epitenon is a delicate, loose connective-tissue sheath containing blood and lymphatic vessels. A–B: Endothelial cells show cell membrane protrusion and several granules and pinocytic vesicles in the cytoplasm. Endothelial cells are surrounded by pericytes and show a well constituted basal membrane (O.M. ×4900, ×3900).
