The embryonic vessels grow through the layer to come in close contact with the maternal blood supply. [ http://amigo.geneontology.org/amigo/term/GO:0060716 ]
Synonyms: blood vessel of labyrinthine layer of placenta blood vessel of placenta labyrinth labyrinthine layer of placenta blood vessel blood vessel of labyrinthine layer labyrinthine layer blood vessel placenta labyrinth blood vessel