part of start stage end stage vein cardinal system anterior cardinal vein ACV zebrafish_anatomy Vein that joins with the posterior cardinal vein to form the common cardinal vein. The anterior cardinal vein (ACV) connects to the primordial hindbrain channel at early stages. At later stages the posterior cerebral vein (PCeV) and the pectoral vein (PV) drain into ACV. The rostral portion of the ACV connects to the primary head sinus (PHS) at 2.5dpf, the PHS is sometimes considered an extension of the ACV. ZFA:0000423 TAO:0000423 rostral cardinal vein pharyngula:prim-5 adult