Where is the azygos vein located and what area does it drain?
The azygos vein usually originates from the posterior aspect of the inferior vena cava, at the level of the renal veins. It ascends within the posterior mediastinum to the level of T4 before it arches above the right pulmonary hilum. It drains into the superior vena cava just before it pierces the pericardium.
What does the azygos system do?
It is responsible for draining the thoracic wall and upper lumbar region via the lumbar veins and posterior intercostal veins 1. It also provides important collateral circulation between the superior and inferior venae cavae should they become obstructed 2.
What flows into the azygos vein?
The major tributaries of the azygos vein are the right intercostal veins (excluding the right supreme (first) intercostal vein that drains into the right brachiocephalic vein), the right superior intercostal vein (usually formed by the union of the second to fourth intercostal veins), the right ascending lumbar and …
Where is the azygos vein located?
The azygos vein originates at the junction of the right ascending lumbar and subcostal veins, entering the chest through the aortic hiatus. It ascends along the anterolateral surface of the thoracic vertebrae and arches ventrally to the right main bronchus at T5–T6, draining into the SVC.
What is unusual about the azygos vein?
Azygos vein is the vein that drains the venous blood from the upper part of the posterior abdominal wall and the thoracic wall. It is very important for the reason that it connects the superior vena cava with the inferior vena cava, and it has very few to no valves.
Where is the azygos and hemiazygos veins located what muscles do they supply blood to?
The azygos and hemiazygos veins are located on either side of the vertebral column, and drain the back and the thoracic and abdominal walls. Their anatomy is variable. They assume particular importance in cases of SVC obstruction where they provide important collateral pathways.
Which veins are part of the azygos system quizlet?
What does the azygos system include? Azygos vein, hemiazygos vein and the accessory hemiazygos vein. Blood from the abdominal wall and thoracic cavity and delivers it to the superior vena cava.
What are the functions of the azygos the hemiazygos and the accessory Hemiazygos veins?
That is, the azygos vein serves to drain most of the posterior intercostal veins on the right side of the body, and the hemiazygos vein and the accessory hemiazygos vein drain most of the posterior intercostal veins on the left side of the body.
Where does the hemiazygos vein drain into?
The accessory hemiazygos vein, also called the superior hemiazygos vein, drains the superior left hemithorax. In a majority of cases there is a small connection to the left superior intercostal vein, and rarely, 1–2% of the time, the accessory hemiazygos vein drains into the brachiocephalic vein [3].
What veins drain into the azygos vein quizlet?
The right superior intercostal vein drains the 2nd, 3rd, and 4th posterior intercostal veins on the right side of the body. It flows into the azygos vein. The left superior intercostal vein drains the 2nd and 3rd posterior intercostal veins on the left side of the body.
Which vein is formed by the union of the brachial and basilic veins?
The axillary vein
The axillary vein is a deep vein of the upper limb that is formed by the union of the brachial and basilic veins. It starts at the lower border of the teres major muscle and ascends medially through the axilla towards the 1st rib, where it is continued by the subclavian vein.
What is the smallest vein?
Capillaries, the smallest blood vessels, connect arteries and veins.
Where does hemiazygos vein drain into?
What are the functions of the azygos thee hemiazygos and the accessory hemiazygos veins?
Does hemiazygos vein drain into azygos?
The hemiazygos vein runs in the posterior mediastinum and drains into the azygos vein at the level of the eighth thoracic vertebra.
What is the name of the large vein that drains blood from the body from above the diaphragm?
superior vena cava
The superior vena cava (SVC) is the superior of the two venae cavae, the great venous trunks that return deoxygenated blood from the systemic circulation to the right atrium of the heart. It is a large-diameter (24 mm) short length vein that receives venous return from the upper half of the body, above the diaphragm.
Which vein drains the left side of the lower thoracic wall?
accessory hemiazygos vein
The posterior intercostal veins drain into the azygos (right side) and hemiazygos and accessory hemiazygos vein (left side).
Which is the longest vein in the body?
Did you know that your Great Saphenous Vein is the longest vein in the human body? Extending from the top of your foot to the upper thigh and groin, THIS vein is the major culprit that causes Varicose Veins.