. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. DEVELOPMENT OF HYDATIDS 249 vesicles or brood capsules, on the inner surface of which in turn there grow a number of little heads or scoleces. Each of the heads has the power ultimately to grow into an adult worm. As there may be a dozen or more of the scolex-bearing brood cap-. FiG. 95. Diagram of portion of small Echinococcus cyst showing daughter cyst (), brood capsules (br. cap.) and invaginated heads (h.). x about 5. sules in a single hydatid, and from six to 30 heads in a single vesicle, the nu
. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. DEVELOPMENT OF HYDATIDS 249 vesicles or brood capsules, on the inner surface of which in turn there grow a number of little heads or scoleces. Each of the heads has the power ultimately to grow into an adult worm. As there may be a dozen or more of the scolex-bearing brood cap-. FiG. 95. Diagram of portion of small Echinococcus cyst showing daughter cyst (), brood capsules (br. cap.) and invaginated heads (h.). x about 5. sules in a single hydatid, and from six to 30 heads in a single vesicle, the number of heads or scoleces produced may be enor- mous. Sometimes there may be still further multiplication by the development of secondary cysts either inside or outside of the original hydatid which may develop a whole series of scolex-bearing vesicles of their own. Sometimes instead of forming the usual large vesicles and secondary vesicles, the growth results in the formation of a great mass of small separate vesicles (Fig. 96), varying in size from a pinhead to a pea, with few and scattered heads. These masses of vesicles, known as " multilocular " cysts, may be six inches or more in diameter; ,, . ~ ,, J. J • .1 1- Fig. 96. Multilocular they are most frequently found m the liver, ^y^^ f^^m liver of steer, f Unless surgically removed they usually prove nat. size. (After Ostertag „ , , , from Stiles.) fatal sooner or later. The fact that the " multilocular " cysts are not found in Ice- land or Australia where the ordinary cysts are so common, and that they occur to the almost total exclusion of the ordinary kinds in some countries, especially in parts of Germany, suggests that they may belong to a different species indistinguishable from E. granulosus in the adult 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 p
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