A pattern, apart from the term's use to mean template, is a discernible regularity in the world or in a manmade design. As such, the elements of a pattern repeat in a predictable manner. A geometric pattern is a kind of pattern formed of geometric shapes and typically repeated like a wallpaper.
The vena cava is the major vein that returns blood to the right atrium of the heart. The vena cava superior returns blood from the head, neck, upper extremities, and chest. The vena cava inferior returns blood from the lower extremities, the pelvis, and the abdomen.
Inferior Vena Cava. Inferior vena cava is the largest vein in the body, which carries deoxygenated blood from the lower half of the body into the right atrium of the heart. It is located posterior to the abdominal cavity and runs to the heart next to the abdominal aorta.uperior Vena Cava. Superior vena cava is a large vein which brings deoxygenated blood into the right atrium of the heart from the upper half of the body, including neck, head and upper limbs. It begins above the heart.