Figure 1330

Splenic sinus and splenic cord structure, a. This scanning electron micrograph shows a cross section of a splenic sinus (SS), revealing the lattice structure of its wall. Through the multiple openings in the wall, processes of macrophages (arrows) are inserted into the sinus lumen. The remainder of the micrograph shows characteristically smooth-surfaced processes of reticular cells (RC). The spaces of the reticular cell framework contain neutrophils (N), macrophages (M), and blood platelets (P). x4,400. b. Schematic diagram of the reconstructed structure of splenic sinus. Note the direction of blood flow in open and closed circulation, c. Scanning electron micrograph of the splenic sinus, showing the architecture of the sinus wall as seen from its luminal side. Rod-like endothelial cells run in parallel and are intermittently connected to each other by side processes. A nuclear swelling is shown at lower right. The tapered ends of a few of the rod cells are seen. The macrophage (M), neutrophil (N), and lymphocyte (L) are outside the sinus, x 5,300. (From Fujita T, Tanaka K, Tokunga J. SEM Atlas of Cells and Tissues. Tokyo: Igaku-Shoin, 1981.)

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[neutrophil trabecular artery trabecular vein central artery closed circulation

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