Well, it's basically a network of blood vessels, a network of capillaries and veins and arteries that actually connects the hypothalamus to our interior pituitary. And because the pituitary gland is also known as the hypothesis, this network of blood vessels is also known as the hypothesia portal system. So basically at the top portion of our blood vessel system we have the superior hypothesial artery. Superior simply means at the top where this section is our inferior. So this is the superior hypothesical. Basically means we're dealing with our hypothesis.