Some fibers from the ventral cochlear nucleus cross the midline in the trapezoid body. Thus, cells in the superior olive receive inputs from both ears and are the first place in the central auditory system where binaural processing (stereo hearing) is possible. The output of the superior olive travels in the lateral lemniscus.
Delay caused by a short stress time is usually a week or two, then you ovulate normally. However, under continued stress (heavy exercise, malnutrition, etc.) you can be anovulatory for a very long time. If you are having problems in this area, have a look at this book: Fertility, Cycles & Nutrition 4th Edition.
Yes, yes and yes. Stress can cause just about anything. Emotional stress (depression, anxiety, worry, insomnia) and physical stress (weight loss or gain, illness,poor diet) can both affect your menstrual cycle. Hormones such as estrogen and progesterone are necessary for normal menstrual cycles to take place.