Alaonttolaskimoon

Alaonttolaskimoon is the Finnish illative form of alaonttolaskimo, meaning "into the inferior vena cava." The inferior vena cava (IVC) is the large vein that returns deoxygenated blood from the lower limbs, pelvis and abdomen to the right atrium of the heart. Formed by the union of the common iliac veins near the level of the fifth lumbar vertebra, the IVC ascends retroperitoneally to the right of the abdominal aorta and passes through the diaphragm at the caval opening (approximately the level of T8).

Major tributaries of the IVC include the lumbar veins, right gonadal vein, renal veins, hepatic veins and phrenic veins, though left-sided venous drainage often connects indirectly via paired veins. Anatomical variations such as duplication or left-sided IVC may occur. Clinically, the IVC is important in conditions like deep vein thrombosis and pulmonary embolism, IVC thrombosis, trauma-induced hemorrhage, and hepatic venous outflow disorders. Radiologic imaging (ultrasound, CT, MRI, venography) evaluates IVC anatomy and pathology. Therapeutic procedures may involve placement of an inferior vena cava filter to reduce embolic risk or surgical repair in case of injury; such interventions are performed by trained specialists.

In Finnish usage, the form alaonttolaskimoon is typically encountered in descriptions of movement or placement into the IVC, for example in imaging, catheterization or interventional procedures.