trophoblastic lacuna


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Related to trophoblastic lacuna: cytotrophoblast, inner cell mass, embryoblast

troph·o·blas·tic la·cu·na

one of the spaces in the early syncytiotrophoblastic layer of the chorion before the formation of villi; in human embryos maternal blood enters these spaces by the 10th day; with the differentiation of the chorionic villi they become intervillous spaces, sometimes called intervillous lacunae.

troph·o·blas·tic la·cu·na

(trō'fō-blas'tik lă-kū'nă)
One of the spaces in the early syncytiotrophoblastic layer of the chorion before the formation of villi; in human embryos, maternal blood enters these spaces by the 10th day; with the differentiation of the chorionic villi they become intervillous spaces, sometimes called intervillous lacunae.
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