Studies on haemopoiesis and histological aspects of Rana ridibunda spleen

H.  AL-saffar, Abdul-majeed

	Studies on haemopoiesis and histological aspects of Rana ridibunda spleen
KUFA MEDICAL JOURNAL
Article 1, Volume 11, Issue 2, 2008, Pages 68-72
Author
Abdul-majeed H. AL-saffar
Abstract
Twenty frogs of R. ridibunda species apparently healthy of both sex were chosen throughout their normal assemble meeting (i.e. Babylon University campus, domestic places and gardens). Their spleen is located in the mesentery of ileum or ileu-dodeunal area posterior to the anterior end of cloacae. It is connected to the mesentery of small intestine by the spleen artery and visceral lymphatic. The spleen consistency is soft, fluffy with a bean like shape or oval to globular shape in some instances with dorso-ventral depressions at both sides. The organ’s color is red to maroon red. The spleen is encapsulated by a connective tissue capsule. Histological picture reveals a red soft surface shows two areas with no obvious border, the white pulp and the red pulp. The red pulp surrounds the white pulp and contains mainly red blood cells and macrophages. The main function of the red pulp is to phagocytes old red blood cells. The white pulp is circular in structure and is made up of lymphocytes it functions in a manner similar to the cells of the lymph nodes. The observed precursors, intermediate as well as mature cells of erythroid, myeloid and lymphoid series in the sub capsular spaces, indicating extramedullary haemopoiesis. At some times the spleen appears as a connective tissue sac filled with erythrocytes which may indicates its ability for blood filling. Thus spleen in these vertebrates is haemo-lymphoid, and also blood filtering organ.

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