Deep Throat

A baby boomer undergoes a physical exam by a resident physician and he is prescribed a visit to an otolaryngologist. Not knowing the specialty of such a physician,  he asks the resident to explain the referral. The resident responds that an otolaryngologist is basically a deep throat doctor and that the boomer has a mass in his neck. The boomer’s first response is to laugh and the resident is baffled. Nevertheless, the boomer visits an otolaryngologist  and after CT imaging he is informed the mass extends from just distal to his left subclavian artery, to his thyroid. Surgery is scheduled with a team of thoracic and otolaryngology surgeons because the mass is close to the aorta. Which area of the body is least likely to suffer a vascular perfusion injury if the aorta is “nicked” at the site of the tumor?

Postscript: While I am sure many thought this question was heading elsewhere, Deep Throat was the name given to the FBI agent and anonymous informant giving Bob Woodward of The Washington Post the scoop during the Watergate Scandal. All boomers remember this term. The image is of the government employee, Mark Felt, who confessed to being Deep Throat prior to his death in 2008 at age 95.

Damage to the aorta distal to the exit of the left subclavian artery will limit sudden vascular insult at which structure/location?