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.
The superior vena cava (SVC) is the superior of the two venae cavae, the great venous trunks that return deoxygenated blood from the systemic circulation to the right atrium of the heart. It is a large-diameter (24 mm), yet short, vein that receives venous return from the upper half of the body, above the diaphragm. (Venous return from the lower half, below the diaphragm, flows through the inferior vena cava.) The SVC is located in the anterior right superior mediastinum. It is the typical site of central venous access (CVA) via a central venous catheter or a peripherally inserted central catheter.