zonula occludens

(redirected from impermeable junction)
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zo·nu·la oc·clu·'dens

tight junctions formed by the fusion of integral proteins of the lateral cell membranes of adjacent epithelial cells, limiting transepithelial permeability.

zonula

(zon'yu-la) [L. zonula, little girdle]
A small zone. Synonym: zonule

zonula adherens

The portion of the junctional complex between columnar epithelial cells below the zonula occludens where there is an intercellular space of about 200 A.U. and the cellular membranes are supported by filamentous material.

zonula ciliaris

Ciliary zonule.

zonula occludens

Tight junction.