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The Mouse Adult Gross Anatomy Ontology and Mammalian Phenotype Ontology are downloaded weekly from the Mouse Genome Informatics databases at Jackson Laboratories ( For more information about these ontologies, see the MGI Publications Page at

Term:abnormal visceral yolk sac morphology
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Accession:MP:0001718 term browser browse the term
Definition:any structural anomaly of the extraembryonic tissue membrane, formed from the visceral endoderm and the extraembryonic mesoderm, which is located ventral to the embryonic disc and is connected to the presumptive midgut of the embryo; the yolk that it contains is the site of embryonic hematopoiesis and vitelline circulation is involved in early embryonic circulation; it is the origin of the primordial germ cells
Synonyms:exact_synonym: abnormal secondary yolk sac morphology;   abnormal umbilical vesicle morphology;   abnormal vitelline sac morphology
 broad_synonym: abnormal yolk sac morphology

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  mammalian phenotype 5415
    embryo phenotype 11
      abnormal extraembryonic tissue morphology 9
        abnormal visceral yolk sac morphology 0
          abnormal visceral yolk sac endoderm morphology 0
          abnormal visceral yolk sac mesenchyme morphology + 0
          absent visceral yolk sac 0
          disorganized yolk sac vascular plexus 0
          excessive folding of visceral yolk sac 0
          pale yolk sac 0
          small visceral yolk sac 0
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