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Pulmonary Pathology Online Anatomy and Histology of the Normal Lung and Airways Examination of pulmonary and pleural biopsies Useful chromatic and immunostains in pulmonary pathology |
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Pigments are coloured substances present in the majority of living forms, including humans, and are widely distributed in our environment both as pollutants and as artifacts of cultural practices such as smoking tobacco and tattooing the skin. Pigments are generally classified into two broad categories:
(1) Endogenous pigments : Endogenous pigments, which are normal constituents of cells and tissues, for example, tyrosine and tryptophan-derived pigments, such as melanin, argentaffin substances and adrenochromes, hemoproteins, which include porphyrins, hemoglobin, and hemosiderin (ferritin) and lipid-rich pigments such as lipofuscin and ceroid; and (2) Exogenous pigments : Exogenous pigments introduced into the body from outside, such as anthracotic pigments, mineral dusts containing silica and oxides of iron, ingested iron, lead, and liver salts, and the various pigments that are used in tattoos of the skin.
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Introduction of Pathology An outline of Diagnostic Techniques available in Pathology Diagram showing Structural Changes in Reversible and Irreversible Cell Injury |