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Yolk plug is the remaining patch of endodermal cells that is created during the formation of the ventral lip of the
blastoporeA blastopore is an opening into the archenteron during the embryonic stages of an organism. The distinction between protostomes and deuterostomes is based on the direction in which the mouth develops in relation to the blastopore...
. It is a patch of large endodermal cells which remains exposed on the vegetal surface of the
amphibianAmphibians , such as frogs, toads, salamanders, newts, and caecilians, are ectothermic animals that metamorphose from a juvenile water-breathing form, to an adult air-breathing form. Though amphibians typically have four limbs, the Caecilians are notable for being limbless. Unlike other land...
blastula that will eventually be internalized by epiboly.