Search -
The Principles and Practice of Veterinary Medicine
The Principles and Practice of Veterinary Medicine Author:William Williams 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: CHAPTER VII. PATHOLOGY—continued. ATROPHY AND DEGEXEKATIONS OF TISSUE—continued. DEGENERATIONS. Atrophy and Degeneration resemble one another, in so ... more »far that, iii both, nutrition is impaired and function interfered with. In atrophy the part may be said to be altered in quantity, the waste of the tissue being in excess of the formation of new material. In degeneration, however, the structure of the part is altered in quality, a new formation being present in the tissues, impairing their vitality and interfering with their functional activity. The degenerations are divided into two classes, namely, the Metamorphoses and the Infiltrations. THE METAMORPHOSES. These consist of an alteration in the albuminoid structures, whereby they are changed into new materials, with disappearance of the elements of the tissue proper, softening of the intercellular substance, and loss of function. The metamorphoses fire the fatty, calcareous, mucoid, colloid, pigmentary, and amyloid degenerations. FATTY DEGENERATION. This is the most common of the degenerations, and consists in the transformation of the albuminoid constituents into fat, or rather in the replacement of the healthy tissues of a part by drops or molecules of an oily nature, which appear asminute granules within the cells of the tissues. A muscular fibre thus affected shows that the sarcous elements, the real Fio. 1.—Fatty degeneration of muHcular tinsue. External matter replaced by oil particle. contractile tissue, within the sarco- lemma, are replaced by shining oil particles, so that the contractile power of such fibre is destroyed. These oil granules, when examined microscopically, present a sharp contour, a dark colour, and strongly refract light They are soluble in ether; and as they increase, they,...« less