tailieunhanh - Báo cáo khoa học: "Morphological structure of accessory spleen in Chinese hamsters"

Tuyển tập các báo cáo nghiên cứu khoa học quốc tế về bệnh thú y đề tài: Morphological structure of accessory spleen in Chinese hamsters | J. Vet. Sci. 2000 1 2 73-75 OURNAL OF Veterinary Science Morphological structure of accessory spleen in Chinese hamsters Yeo-Sung Yoon Jae-Won Shin1 Cheol-Beom Park Yang-Seok Oh2 In-Se Lee Heungshik S. Lee and Joon-Sup Lee College of Veterinary Medicine and School of Agricultural Biotechnology Seoul National University Suwon 441-744 Korea. Department of Veterinary Medicine Kangwon National University Chunchon 200-701 Korea Experimental Animal Center College of Medicine Hallym University Chunchon 200-702 Korea To attempt a rigorous definition of the structure of the accessory spleen AS in the Chinese hamster we examined twenty-one animals and found AS in 5 animals which were over 7-month-old. The AS had no connection with the main spleen and was seen as a dark red oval organ mm X mm which was embedded in the adipose tissue near the tail of the pancreas. It was demarcated from the adipose tissue and some pancreatic tissue. The organ was encapsulated by thin collagenous connective tissue and smooth muscle fibers and contained lymphatic nodules reticular fibers nodular central arterioles macrophages and megakaryocytes. Notably the incidence of AS appeared to increase with age in the Chinese hamsters. Key words accessory spleen Chinese hamster histology Introduction There have been many reports on the incidence and histology of the accessory spleen AS in humans 1-4 rabbits 5 6 chickens 7 mice 8 apes 9 and pigs 10 but these are rarely found in the Chinese hamster. Although Isegawa et al 11 have observed AS in the golden hamster APA the morphological structures were not described. It would appear that the AS probably represents a type of developmental failure 12 . Although it has been recognised that certain congenital malformations of the spleen are frequently associated with other congenital malformations of body system it has not been previously shown that the presence of an AS is a marker for the occurrence of another malformation 1 . It is recognized .

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