oPCOS

 Definitions:

Oligomenorrhea, is the medical term for infrequent uterine bleeding episodes with intervals of more than 35 days. The duration of such events may vary... http://en.wikipedia.org/wiki/Oligomenorrhea

Amenorrhœa, is the absence of a menstrual period in a woman of reproductive age. Physiological states of amenorrhoea are seen during pregnancy and lactation (breastfeeding), the latter also forming the basis of a form of contraception known as the lactational amenorrhea method. Outside of the reproductive years there is absence of menses during childhood and after menopause. http://en.wikipedia.org/wiki/Amenorrhea

Hypothalamus, The hypothalamus is a portion of the brain that contains a number of small nuclei with a variety of functions. One of the most important functions of the hypothalamus is to link the nervous system to the endocrine system via the pituitary gland (hypophysis).... The hypothalamus controls body temperature, hunger, thirst, ^[1] fatigue, and circadian cycles. http://en.wikipedia.org/wiki/Hypothalamic

Pituitary Gland, The pituitary gland, or hypophysis, is an endocrine gland about the size of a pea and weighing 0.5 g (0.02 oz.). It is a protrusion off the bottom of the hypothalamus at the base of the brain, and rests in a small, bony cavity (sella turcica) covered by a dural fold (diaphragma sellae).... The pituitary gland secretes hormones regulating homeostasis, including tropic hormones that stimulate other endocrine glands. It is functionally connected to the hypothalamus by the median eminence. http://en.wikipedia.org/wiki/Pituitary_gland