The spleen of six young porcain aging (2 month) each spleen was examined macroscopically and was studied using light and transmission electron microscopy. The spleen is an important lymphoid organ of immunological defence. The type of pig spleen is sinusal type spleen It has a role in many hematological functions as storage, filtration and maturation of reticulocytes. The splenic parenchyma of young pig consisted of white and red pulp the whit pulp formed of few sporadic lymphocytes and seldomly found lymphatic nodules, occasionally single ovoid mass of lymphoid nodule the peri-arterial lymphatic sheath was few in pig spleen Ellipsoids (pericapillary macrophage sheath) were not clearly defined in the marginal zone which is not well demarcated. The red pulp occupied the majority of pig spleen it consisted of splenic cords and presence of few and small sized blood sinusoids lined by flat endothelial cells containing different blod cells as neutrophils and blood platlets. In spite of that the histology of the spleen was describe in different animals species, to the best of our knowledge there is no available literature concerned with the histology of the Egyptian pig spleen so we aimed in our study to illustrate the main difference of splenic parechyma.
Key words: : Pig ,spleen, sinusoid
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