Lymphatic vessels are present throughout the entire body, including the brain, skin, and adipose tissue, to collect waste products and excess fluid from the interstitial space.

“Your entire body is innervated, as we say, by these lymphatic vessels, right? From your little pinky toe, and all your toes, and your feet, any tissue in your body because it needs blood and oxygen and nutrients, and because the cells there create waste products, and because some of that fluid remains in the interstitial space, doesn't make it back into the vasculature, you need lymphatic vessels everywhere. You need them in your brain, you need them in your skin, you need them in your adipose tissue, your fat, that is. You need them everywhere.”