Let me help you with this: the hypothalamus synthesizes some hormones that are released into blood vessels bound for another gland, synthesizes oxytocin and ADH and integrates nervous system and endocrine system. The posterior pituitary gland is an extension of the hypothalamus and releases oxytocin. And the anterior pituitary is regulated by hormones released into portal blood vessels, synthesizes and releases TSH and synthesizes and releases PRL.
