in taxon Carnivora Eutheria Cetacea Rodentia choroid tapetum lucidum choroidal tapetum cellulosum UBERON:0010247 The choroidal stroma adjacent to the tapetum lucidum contains numerous small blood vessels that penetrate the tapetal layer to form a single-layered capillary network, known as the choriocapillaris, on the surface of the tapetum. The tapetum cellulosum is thus interposed between the large branching vessels in the choroid and the single layer of the choriocapillaris beneath the retinal epithelium[PMID:14738502] choroid tapetum cellulosum A choroid tapetum lucidum that consists of layers of cells containing organized, highly refractive crystals. These crystals are diverse in shape and makeup. Wikipedia:Tapetum_lucidum#Classification