Final answer:
The three zones of the endometrium are zona compacta, zona spongiosa, and zona basalis. Zona compacta undergoes rapid cell proliferation, zona spongiosa contains uterine glands, and zona basalis does not shed during menstruation.
Step-by-step explanation:
Three Zones of the Endometrium
The endometrium, the innermost layer of the uterus, is divided into three zones:
Zona compacta: This is the outermost layer of the endometrium which undergoes rapid cell proliferation and thickens in response to estrogen and progesterone.
Zona spongiosa: This middle layer is highly vascularized and contains the major portion of uterine glands.
Zona basalis: This is the innermost layer adjacent to the myometrium and does not shed during menstruation.