In detail describe what happens in the thyroid negative feedback cycle

In the negative feedback cycle for the thyroid, the level of thyroxine in the blood is monitored by the brain and when this level falls the pituitary gland in the brain, releases the hormone TSH into the bloodstream. TSH tiggers the thyroid gland to release more thyroxine into the blood. This increased level of thyroxine is detected by the brain which prevents the pituitary gland form releasing any more TSH. And as the TSH level falls the thyroid gland releases less thyroxine.