Some of these incoming fibers go to the motor nucleus of the trigeminal nerve (V), bypassing the pathways for conscious perception. The jaw jerk reflex is an example; tapping the jaw elicits a reflex closure of the jaw in the same way that tapping the knee elicits a reflex kick of the lower leg.
FSH stimulates the production of eggs and LH stimulates the release of the egg. FSH and LH are produced by the pituitary gland in the brain. There are four stages in the menstrual cycle. Stage 1. Days 1-4. Menstruation (bleeding) occurs. The lining of the uterus disintegrates and is shed. This is due to low levels of progesterone. Stage 2. Days 4-14. The uterine lining grows back.
The thickening of the uterine lining which is seen on ultrasound does not necessarily mean that someone has endometriosis. A thickening in the muscular walls of the uterus MIGHT suggest that endometriosis is inside the walls. This is called adenosis. More commonly, a thickened uterine lining is either from hormonal influences--or from polyps of the lining of the uterus (endometrial polyps).