| Lab 12 Immune System: 1) Index 2) Introduction 3) Things to Identify 4) Diffuse Lymphoid Tissue 5)Solitary and Aggregated Lymphoid Nodules 6) Tonsils 7) Lymph Node 8) Spleen 9) Thymus 10)Comparison 11) Practical |
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Introduction Organs, in general, are composed of a stroma (supporting framework of connective tissue) and a parenchyma (mass of essential and characteristic cells which carry out the organ's functional activities). Lymphoid tissues (except the thymus) are characterized by a stroma of reticular connective tissue composed of reticular cells and fine reticular fibers. The parenchyma is made up primarily of free cells, such as lymphocytes, monocytes, macrophages, plasma cells, and eosinophils, which are interspersed among the meshwork of the reticular stroma. Lymphoid tissues and organs include a variety of structures, many of which have characteristic staining patterns readily identified with the naked eye. For this reason, it is especially useful to look carefully at your slides before placing them on the microscope stage. |