1882 Endometrium.
1907 Dec. 792 The endometrium was normal.
1912 J. G. Adami & J. McCrae 647 The histological appearances of the endometrium in certain stages of the menstrual cycle.
1956 14 Jan. 59/1 Mechanical irritation of the endometrium during the luteal phase of the œstrous cycle will provoke the formation of decidual cells.