Pituitary Stalk (Infundibulum): This critical but delicate neurovascular structure (comprised of nerves and blood vessels) is the connection between the hypothalamus and the pituitary gland. It carries the hypothalamic releasing hormones for the anterior pituitary gland and also axons from the magnocellular neuro-secretory cells of the hypothalamus to the posterior pituitary where they release their hormones oxytocin and antidiuretic hormone (ADH) into the blood. Learn more.