Diseases of the Urinary Apparatus

Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: II. Outline Of The General Pathology Op Thb Urinary Apparatus. General pathology, the foundation of special pathology, indicates the nature and constituent elements of morbid processes, and therefore their names and classes. From its study are deduced general principles for guidance in special pathology....
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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: II. Outline Of The General Pathology Op Thb Urinary Apparatus. General pathology, the foundation of special pathology, indicates the nature and constituent elements of morbid processes, and therefore their names and classes. From its study are deduced general principles for guidance in special pathology. It establishes the technical language and constitutes the chief part of the science of medicine. It has for its basis bio-chemistry, physiology, embryology, and histology. A fair knowledge of each of these branches of biology is indispensable to the right understanding of the processes of disease. To bio-chemistry and physiology it is not now necessary to do more than allude, but to the cardinal points in the principles of embryology and histology it is proper that a little space be devoted as an introduction to the arrangement of the subjects of future examination. It is well known that the elementary tissues of the human body are all derived from a primordial ovule, which, originally spherical in form, undergoes segmentation soon after its fecundation. This ovule then undergoes certain changes of form and size by invagination of one of its halves into the other, giving rise to what is called the gas- trula. At this period of the life of the blastodermic vesicle, three parts consisting of cells are specialized, to wit: the epi- blast, the hypoblast, and the mesoblast. From the epiblast arise] the epidermic covering of the body and, it is said, also the brain; from the hypoblast is formed the epithelium of the internal mucous membranes; and from the mesoblast come the blood-cells, the endothelial or connective tissues (comprising mucous, glious, fibrous, cartilaginous, and osseous tissues), muscle tissue, and nerve tissue. Many of the cells, particularly those derive...