part of develops from start stage end stage liver trunk vasculature subintestinal vein hepatic sinusoid zebrafish_anatomy TAO:0005091 ZFA:0005091 hepatic sinusoids Wide thin-walled blood vessels in the liver. The terminal branches of the hepatic portal vein and hepatic artery empty into the sinusoids where the blood mixes. In mammals they have neither venous or arterial markers. Sinusoids are scattered throughout the parenchyma and appear small and round. blood vessel unknown adult