TY - CHAP M1 - Book, Section TI - Abnormal Uterine Bleeding A1 - Hoffman, Barbara L. A1 - Schorge, John O. A1 - Halvorson, Lisa M. A1 - Hamid, Cherine A. A1 - Corton, Marlene M. A1 - Schaffer, Joseph I. Y1 - 2020 N1 - T2 - Williams Gynecology, 4e AB - The endometrium is the source of most abnormal reproductive tract bleeding. It consists of two distinct zones, the functionalis layer and the basalis layer (Fig. 8-1). The basalis layer lies in direct contact with the myometrium and beneath the functionalis layer. The basalis serves as a reservoir for regeneration of the functionalis layer following menses. In contrast, the functionalis layer lines the uterine cavity and undergoes dramatic change throughout the menstrual cycle. It ultimately sloughs during menstruation. Histologically, the functionalis has a surface epithelium and underlying subepithelial capillary plexus. Beneath these are stroma, glands, and interspersed leukocytes (Fig. 33-1, p. 701). SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/12/11 UR - obgyn.mhmedical.com/content.aspx?aid=1171528733 ER -