A sac (bag or pouch) like membranous extension of the gut containing nutritive materials (yolk) found in the larvae of bony fishes and the embryos of reptiles, birds and primitive mammals. It is situated at the ventral side of sac
A sac (bag or pouch) like membranous extension of the gut containing nutritive materials (yolk) found in the larvae of bony fishes and the embryos of reptiles, birds and primitive mammals. It is situated at the ventral side of sac