Head and neck anatomy may be important in the development of the BBB. Astrocytes may also be responsible for transporting ions (electrolytes) from the brain to the blood. Blood from the brain and neck flows from: (1) within the cranium via the internal jugular veins, a continuation of the sigmoid sinuses. The right and left external jugular veins drain from the parotid glands, facial muscles, scalp into the subclavian veins. The right and left vertebral veins drain the vertebrae and muscles into the right subclavian vein and into the superior vena cava, into the right atrium of the heart. The lymphatic system drains the
The Awkward Yeti of "The Awkward Yeti". "Heart and Brain" features Lars' anthropomorphized heart and brain as the two main characters. In the webcomic, the heart follows its feelings and emotions, chasing down butterflies and getting excited about kittens, while the brain is concerned about adult responsibility. While the heart skips to emotional need, the brain brings in reason and logic for why the heart's action are ill-advised. Lindsey Holmes described "Heart and Brain" as "the internal tennis match we often face between our romantic hearts and our realistic brains." The characters of "Heart and Brain" are considered very relatable, as they cover