By Rachel Crowe,  January 18, 2022

“The endometrium is divided into three layers—the stratum compactum, stratum spongiosum and the stratum basalis. The [former two] make up the stratum functionalis, which becomes vascularized, expands, and sloughs off, while the basalis remains constant,” said Kecia Gaither, M.D., an OB-GYN, director of Perinatal Services at NYC Health + Hospitals.

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