Systemic venous system
Encyclopedia
In human anatomy
, the systemic venous system refers to vein
s that drain into the right atrium
without passing through two vascular beds (i.e. they originate from a set of capillaries
and do not pass through a second set of capillaries before reaching the right side of the heart
).
The term systemic venous system is often used to differentiate veins from veins that drain the pulmonary
system (the pulmonary venous system
) and veins that drain the digestive tract
(the portal venous system
).
Large veins that are considered part of the systemic venous system are the:
Human anatomy
Human anatomy is primarily the scientific study of the morphology of the human body. Anatomy is subdivided into gross anatomy and microscopic anatomy. Gross anatomy is the study of anatomical structures that can be seen by the naked eye...
, the systemic venous system refers to vein
Vein
In the circulatory system, veins are blood vessels that carry blood towards the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated blood to the heart...
s that drain into the right atrium
Right atrium
The right atrium is one of four chambers in the hearts of mammals and archosaurs...
without passing through two vascular beds (i.e. they originate from a set of capillaries
Capillary
Capillaries are the smallest of a body's blood vessels and are parts of the microcirculation. They are only 1 cell thick. These microvessels, measuring 5-10 μm in diameter, connect arterioles and venules, and enable the exchange of water, oxygen, carbon dioxide, and many other nutrient and waste...
and do not pass through a second set of capillaries before reaching the right side of the heart
Heart
The heart is a myogenic muscular organ found in all animals with a circulatory system , that is responsible for pumping blood throughout the blood vessels by repeated, rhythmic contractions...
).
The term systemic venous system is often used to differentiate veins from veins that drain the pulmonary
Pulmonary vein
The pulmonary veins are large blood vessels that carry blood from the lungs to the left atrium of the heart. In humans there are four pulmonary veins, two from each lung...
system (the pulmonary venous system
Pulmonary circulation
Pulmonary circulation is the half portion of the cardiovascular system which carries Oxygen-depleted Blood away from the heart, to the Lungs, and returns oxygenated blood back to the heart. Encyclopedic description and discovery of the pulmonary circulation is widely attributed to Doctor Ibn...
) and veins that drain the digestive tract
Gastrointestinal tract
The human gastrointestinal tract refers to the stomach and intestine, and sometimes to all the structures from the mouth to the anus. ....
(the portal venous system
Portal venous system
In human anatomy, the hepatic portal system is the system of veins comprising the hepatic portal vein and its tributaries. It is also called the portal venous system, although it is not the only example of a portal venous system, and splanchnic veins, which is not synonymous with hepatic portal...
).
Large veins that are considered part of the systemic venous system are the:
- Superior vena cavaSuperior vena cavaThe superior vena cava is truly superior, a large diameter, yet short, vein that carries deoxygenated blood from the upper half of the body to the heart's right atrium...
- Inferior vena cavaInferior vena cavaThe inferior vena cava , also known as the posterior vena cava, is the large vein that carries de-oxygenated blood from the lower half of the body into the right atrium of the heart....
See also
- Pulmonary venous system
- Portal venous systemPortal venous systemIn human anatomy, the hepatic portal system is the system of veins comprising the hepatic portal vein and its tributaries. It is also called the portal venous system, although it is not the only example of a portal venous system, and splanchnic veins, which is not synonymous with hepatic portal...