Sagittal Cut Representation of the Endometrium

Description

Shown in sagittal section through the uterus, the endometrium (tunica mucosa uteri) lines the uterine cavity and lies internal to the myometrium, with the stratum functionalis facing the lumen and the deeper stratum basalis anchored against the muscular wall. Tubular uterine glands extend inferiorly from the surface epithelium into the lamina propria, coursing perpendicular to the cavity before approaching the basalis. In a reproductive age female, the gland profiles and stromal compartment make the mucosa easy to distinguish from the adjacent myometrium. Clear layering. This slice matters because most diagnostic and procedural decisions in abnormal uterine bleeding depend on where pathology arises relative to the basalis. Endometrial hyperplasia and carcinoma originate in the mucosa, while adenomyosis represents endometrial glands and stroma displaced into the myometrium, a distinction that reads directly from the gland depth and the endometrial myometrial junction. The same relationships guide dilation and curettage, hysteroscopy, and suction sampling, where the clinical aim is to remove or biopsy the functionalis while preserving the basalis for regeneration, and to recognize decidual change when pregnancy transforms the endometrium into decidua. Use this illustration in gross anatomy and reproductive histology teaching to reinforce sagittal orientation, mucosal layering, and uterine gland architecture, and in OB GYN texts discussing the menstrual cycle, implantation biology, and biopsy interpretation. It also fits patient education or consent materials for endometrial biopsy, hysteroscopy, and evaluation of postmenopausal bleeding. Anatomical accuracy verified by SciePro's Medical Advisory Board.