Angiography or arteriography is a medical imaging technique used to visualize the inside, or lumen, of blood vessels and organs of the body, with particular interest in the arteries, veins and the heart chambers. This is traditionally done by injecting a radio-opaque contrast agent into the blood vessel and imaging using X-ray based techniques such as fluoroscopy.
Here are shown carotid arteries (internal and external), that bring oxygenated blood to the head. The right arm has been raised to show how the subclavian artery passes under the collar bone (clavicle), becoming axillary artery, and into the arm, becoming brachial artery.
(Picture by www.focus.it).