The endothelium is relatively thin with little endometrial proliferation or gland development. This is due to the absence of the ovarian steroids oestradiol and progesterone. The glands are lined by '''simple cuboidal epithelium'''. | The endothelium is relatively thin with little endometrial proliferation or gland development. This is due to the absence of the ovarian steroids oestradiol and progesterone. The glands are lined by '''simple cuboidal epithelium'''. |