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Uterus in early secretory phase (100X)

Microimage
Functional layer of the endometrium. Image copyright: University of Oslo, CC BY-NC-ND 4.0. (Tissue stain: H+E).

This is a close-up of the functional layer of the endometrium. The lumen of the glands are filled with secretion. Late in this secretory phase, the blood vessels to this layer contract, and that is how the menstruation starts. After the menstruation, the endometrium is rebuilt from the basal layer.

Published June 22nd 2019, updated August 26th 2020.