The word "subclavian" refers to a major artery in our body that is located beneath the collarbone. It carries blood from the heart to the arms and other parts of the upper body. Full definition
Surgical management of an aberrant left subclavian artery originating from a left patent ductus arteriosus in a dog with a right aortic arch and abnormal branching. (vetmed.auburn.edu)
Chylomicrons enter the bloodstream via the thoracic duct, which bypasses the liver to dump directly into the left subclavian vein. (drcate.com)
I'm not a Veterinarian, but Gray's Anatomy suggests: «As the recurrent nerve hooks around the subclavian artery or aorta, it gives off several cardiac filaments to the deep part of the cardiac plexus. (religion.blogs.cnn.com)