Embryonic Structure
trophoblast Audio
troph·o·blast [ trof-uh-blast, troh-fuh- ]
Subclass of:
Endocrine Cells; Blastocyst; Placenta
Definitions related to trophoblast:
  • A thin layer of cells that helps a developing embryo attach to the wall of the uterus, protects the embryo, and forms a part of the placenta.
    NCI Dictionary of Cancer Terms
    U.S. National Cancer Institute, 2021
  • Embryonic cells that form the wall of the blastocyst and function to adhere and implant the embryo into the uterine wall, as well as provide nutrients to the embryo, and which will eventually give rise to the embryonic part of the placenta.
    NCI
    U.S. National Cancer Institute, 2021
  • Cells lining the outside of the BLASTOCYST. After binding to the ENDOMETRIUM, trophoblasts develop into two distinct layers, an inner layer of mononuclear cytotrophoblasts and an outer layer of continuous multinuclear cytoplasm, the syncytiotrophoblasts, which form the early fetal-maternal interface (PLACENTA).
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
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