part of part of adjacent to adjacent to endometrium myometrium organ component layer reproductive structure basal layer of endometrium https://github.com/obophenotype/uberon/issues/3803 https://upload.wikimedia.org/wikipedia/commons/8/87/Cells_of_the_uterus_in_different_menstrual_cycle_stages.png FMA:86492 stratum basalis of endometrium stratum basale endometrii UBERON:0022355 The layer of the endometrium adjacent to the myometrium, comprising the basal portions of the uterine glands and the surrounding vascularized stroma, and supplied by the basal arteries. In menstruating species it is retained at menstruation and serves as the regenerative source from which the functional layer is restored; it harbours the epithelial and mesenchymal progenitor cell populations responsible for that regeneration. pars basalis of endometrium endometrial basal layer basalis layer NCIT:C32189