Vena Hemiazygos Accessoria (Noun)
Meaning
A vein formed by the union of the 4th to 7th posterior intercostal veins; empties into the azygos vein.
Classification
Nouns denoting body parts.
Examples
- The accessory hemiazygos vein is derived from the union of the fourth to seventh posterior intercostal veins which drain the blood from the posterior walls of the thorax.
- The vena hemiazygos accessoria is usually formed by the junction of the fourth to the seventh posterior intercostal veins and it may also include the fifth left posterior intercostal vein.
- The accessory hemiazygos vein, formed from the junction of the fourth to seventh posterior intercostal veins, then crosses over the aortic hiatus and ultimately terminates in the azygos system, specifically unites in the azygos vein.
- Vena hemiazygos accessoria is also found in the posterior mediastinum, within which this particular vein will also act on a comparable fashion with other related structures in this compartment of the thoracic cavity.
- The formation of vena hemiazygos accessoria by those listed posterior intercostal veins occurs due to the anatomical reasons of preventing any potential damage to the heart; heart which at times can at the turn of unforeseen events, such as unrequired physical violence go into shock, despite the various measures being pursued to maintain order.