1 Gently rub a pumice stone back and forth across the affected area for three to five minutes and then pat dry your feet. 2  Dip a cotton ball in castor oil and place it on the corn. Secure it with tape and leave it on overnight.  The next morning, remove the bandage and apply castor oil several times a day.
1. I am confused regarding the presence of valves in the superior vena cava. The superior vena cava does not possess valves unlike inferior vena cava, which possesses Eustachian Valve.
It goes back to your heart. Superior vena cava is a vein therefore, it transports blood back to the heart. If you mean to ask where does the blood come from that passes through the superior vena cava, then the answer is from the head and arms. Was this helpful? Let the contributor know!