sinusoid: distributed in liver, spleen, and some endocrine glands a greatly enlarged diameter endothelial cell: intercellular clefts are large between cells, many pores without diaphragm absence of a continuous basement membraneSinusoid: ▪ distributed in liver, spleen, and some endocrine glands ▪ a greatly enlarged diameter ▪ endothelial cell: intercellular clefts are large between cells, many pores without diaphragm ▪ absence of a continuous basement membrane