extraembryonic tissue morphology trait Reichert's membrane morphology trait Any measurable or observable characteristic related to the shape, structure, color, or pattern of the extraembryonic basement membrane in rodents that forms on the inner surface of the trophectoderm and is secreted by the distal endoderm; required for the maternofetal exchange of nutrients and is important for the post-gastrulation development. Trait.ontology VT:0003954