I. Left subclavian vein.
K. Lower end of left internal jugular vein.
L. Right internal jugular vein.
M. Right subclavian vein.
N. Innominate artery—brachio-cephalic.
O. Left subclavian artery crossed by left vagus nerve.
P. Right subclavian artery crossed by right vagus nerve, whose inferior laryngeal branch loops under the vessel.
Q. Right common carotid artery
R. Trachea.
S. Thyroid body.