the spleen of neoceratodus forsteri krefft grows in the shape of a `` '' boomerang `` '' on the left lateral-dorsal-right lateral part of the borderline between the foregut and the yolkgut . development of the spleen follows the following stages : 1 ) appearance of the splenic primordium as a mesenchymal condensation in a limited portion of the region supplied by the third and fourth vitelline arteries on both sides , 2 ) development of the splenic sinuses within the primordium , 3 ) formation of the `` '' gastric '' '' and enteric splenic portal systems and 4 ) growth of the spleen along the anterior extremity of the spiral valve .
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