MICROANATOMY

Detailed explanation-1: -Superior vena cava collects deoxygenated blood from the upper half of the body or in this case, head and neck, upper limbs, along with thoracic wall, and upper abdomen and drains it into the right atrium of heart.

Detailed explanation-2: -What are the jugular veins? The jugular veins are major blood vessels that stretch from your head to your upper chest. Typically, there are three pairs of jugular veins-six in total-each of which directs blood from different areas of your head toward your heart.

Detailed explanation-3: -The function of the internal jugular vein is to collect blood from the skull, brain, superficial parts of the face, and the majority of the neck. The tributaries of the internal jugular include the inferior petrosal sinus, facial, lingual, pharyngeal, superior and middle thyroid, and, occasionally, the occipital vein.

Detailed explanation-4: -The right and left brachiocephalic veins, also known as the innominate veins, join to form the superior vena cava posterior to the inferior border of the first right costal cartilage. These veins carry blood from the chest wall, esophagus, lungs, neck, and pericardium.

Detailed explanation-5: -The brain is a tremendously well-perfused organ, receiving up to 20% of the resting cardiac output. This blood flow reaches the brain via the internal carotid arteries and the vertebral arteries and ultimately gets drained by the internal jugular veins.