start stage end stage vein mesencephalic vein MsV Paired veins that sprout from the dorsal midline junction and dive ventrally. The mesencephalic veins are fed by the mesencephalic arteries, after 2.5 dpf, and drain into the dorsal longitudinal vessel after 5dpf. TAO:0005092 zebrafish_anatomy ZFA:0005092 unknown hatching:long-pec