抄録
The spleens in the Banti syndrome were histologically and histometrically examined for the findings accounting for increased total splenic blood flow and reduced blood flow per unit splenic volume in this syndrome. By graphical reconstruction of serial histological sections it was demonstrated that about 10-20% of the arteriolar terminals opened directly into the sinuses, while such an arteriolosinal shunt was only exceptionally found in the normal spleens and in splenomegaly not accompanied by portal hypertension. The finding was interpreted in association with sinus hyperplasia and regarded as an evidence of lowered vascular resistance. The surface area of the boundaries between the splenic cords and sinuses per unit splenic volume was found remarkably increased in the Banti spleens and was considered to contribute also to lowering peripheral resistance to blood flow. On the other hand, the arteriolar terminals were found smaller in radius in the Banti spleens than in the normal spleens, although the arterial vascularity was the same in both conditions. Combined effects of different anatomical findings were evaluated in discussing the peripheral circulation of the Banti spleens.
