Uberon definition : An unpaired vein which in humans arises from the right ascending lumbar vein or the
vena cava, enters the thorax through the aortic orifice in the diaphragm, and terminates
in the superior vena cava; unlike humans, mice have a single and left-sided azygos
vein that develops from the paired embryonic cardinal venous system and drains most
of the right and left thoracic walls into the left anterior vena cava[MP].;
An unpaired vein which in humans arises from the right ascending lumbar vein or the
vena cava, enters the thorax through the aortic orifice in the diaphragm, and terminates
in the superior vena cava; unlike humans, mice have a single and left-sided azygos
vein that develops from the paired embryonic cardinal venous system and drains most
of the right and left thoracic walls into the left anterior vena cava[MP].