Plates 1 A and B. Uterine session of a rat from the control group stain with H/E X 100 and X400. The three (3) layers of the endometrium, myometrium and perimetrium were distinct. Characterized with tall columnar cells at the epithelia lining, showing the basic features of the uterus; the two distinct layers of endometrium and myometrium. The endometrium classically revealed the brush border and the tall columnar epithelium lining the inner layer of endometrium. The endometrium two functional layers, the luminal stratum and the basal stratum basalis were shown.