Widow Maker

In days of yore a “Widow’s Walk” was an elevated deck around the upper roof of deluxe seaside homes. From this vantage point a seaman’s wife could pace and privately scan the horizon surveying the harbor for the safe arrival of her husband’s ship. Sadly (depending on your point of view), many never returned thereby making the architectural element along which the wife stepped back and forth:   a “Widow’s Walk”. In the 20th century, a different life-threatening event was identified by cardiologists: the clogged coronary arteries.   And because the anterior interventricular artery has the highest frequency of being blocked, it gained the moniker of the “Widow Maker”. Talk about another male in the coffin! The current strategy used to unclog blocked arteries is to insert medicated stents. If a stent does not relieve the symptoms of the clog, then a bypass procedure remains an option. In the image, which is the anterior interventricular artery (left anterior descending artery, or LAD)?

Image is of Michael E. DeBakey, M.D., one of the early pioneers of bypass surgery.

Left anterior descending artery is indicated by which numbered line?