. A text book of veterinary pathology, for students and practitioners. Veterinary pathology. PROGRESSIVK TISSUE CHANGES. 191 HYPERl'LASIA. DEFINITION. VARIETIES. Piireiu-liyinatous. Interstitial ETIOLOGY. APPEARANCE. Macroscopic. Microscopic. TISSUE AFFECTED. EFFECTS. flyperplasia. according to the derivation of the word, is ex- cessive formation. Hvperplasia and hypertrophy are incorrectly used interchangeably by some. Hyperplasia should be used to designate the condition resulting from an abnormal increased size of a part due to an increase in the number of cells of the part. Accepting the l
. A text book of veterinary pathology, for students and practitioners. Veterinary pathology. PROGRESSIVK TISSUE CHANGES. 191 HYPERl'LASIA. DEFINITION. VARIETIES. Piireiu-liyinatous. Interstitial ETIOLOGY. APPEARANCE. Macroscopic. Microscopic. TISSUE AFFECTED. EFFECTS. flyperplasia. according to the derivation of the word, is ex- cessive formation. Hvperplasia and hypertrophy are incorrectly used interchangeably by some. Hyperplasia should be used to designate the condition resulting from an abnormal increased size of a part due to an increase in the number of cells of the part. Accepting the last definition, hyperplasia mav be due to an increased numljer of parenchymatous cells, or an increased number of interstitial cells the two types l)eing called parench}'- matous hvperplasia and interstitial hyperplasia respectively. Parenchymatous hyperplasia and numerical hypertrophy are sometimes used synonymously^ Interstitial hyperplasia is prac- tically the same as fibrous hyperplasia. Parcnchxiiialous hyperplasia is not of common occurrence It is usualiv either inherited or congenital. The descended or scrotal testicle of single cryptorchids is usually enlarged I^ecause of an increased amount of parenchyma and hence is an example of parenchymatous Interstitial h>"ptjrp FiK 108.—Hyperplasia Interstitial Testieular Cells. tissue. b. Seminiferous not fully Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Kinsley, Albert Thomas, 1877-. Chicago, A. Eger
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