Uterus in early secretory phase (400X) Glandular ostium. Image copyright: University of Oslo, CC BY-NC-ND 4.0. (Tissue stain: H+E). Magnify Labels Up (40X) At this magnification the columnar epithelium is visible. At the center there is a glandular ostium. Published June 22nd 2019, updated August 26th 2020. Share on Facebook Tweet Send email