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Primo-vessel and node. (a) Electron micrograph of the internal primo-vessel (cross section) (×42,000). BL: primo-fluid, BD: p-subvessel, IS: interstitial substance, WBD: external envelope of p-subvessel, ENBD: endothelial nucleus of the p-subvessel, and CEC: cytoplasm of endothelial cell [7]. (b) Diagram of the transversal section of a primo-node. 1: Primo-node; 2: primo-vessel; 3: node capsule; 4: lumens; 5: p-microcells.
