ANATOMY

Detailed explanation-1: -The brachiocephalic veins are formed at the confluence of the subclavian and internal jugular veins behind the sternoclavicular joints (see Figure 2.4). The right brachiocephalic vein is short, about 2–3 cm, and lies anterior to the innominate artery.

Detailed explanation-2: -Internal: The internal jugular veins lead into the subclavian veins under your collarbones. Once they do, they become the brachiocephalic (bray-key-oh-sef-al-ick) veins, whose name means “related to the arms and head.”

Detailed explanation-3: -Blood returning from the arm passes through a number of superficial and deep veins, which combine in the upper part of the arm underneath the pectoralis minor muscle to form the axillary vein. As it passes under the clavicle, the axillary vein becomes the subclavian vein.

Detailed explanation-4: -Tributaries and drainage area Via these tributaries, the brachiocephalic veins receive venous blood from the head, neck, upper limb, and the upper part of the thorax.