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The Human Phenotype Ontology (HPO) is downloaded weekly from The file downloaded is considered the "last stable build" available for the ontology. For more about the HPO, view their website at

Term:Abnormal placental membrane morphology
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Accession:HP:0011409 term browser browse the term
Definition:Structural anomaly of the fetal membranes (also known as the amniochorionic or placental membranes), which comprise a vital intrauterine compartment, where they perform mechanical, immune, and endocrine functions to promote growth of the fetus and protection from environmental adversity. Amniochorionic membranes anatomically consist of a single layer of cuboidal amnion epithelial cells, chorionic trophoblasts, and scattered fibroblasts connected by a layer of type IV collagen-rich extracellular matrix.
Synonyms:exact_synonym: Abnormality of placental membranes
 xref: UMLS:C4023369

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  Human phenotype 0
    Phenotypic abnormality 0
      Abnormality of prenatal development or birth 0
        Abnormalities of placenta or umbilical cord 0
          Abnormal placental membrane morphology 0
            Amniotic Sheet 0
            Amniotic constriction ring + 0
            Chronic villitis 0
            Spontaneous chorioamniotic separation 0
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