hemizygos vein
Definition
- Noun:
- A specific vein in the thoracic cavity: The hemizygos vein is a venous structure that drains blood from the lower left posterior thoracic and abdominal walls. It is a continuation of the left ascending lumbar vein, ascends on the left side of the vertebral column, crosses to the right side around the 8th thoracic vertebra, and typically empties into the azygos vein.
Usage Examples
- Noun:
- The surgeon carefully avoided the hemizygos vein during the posterior thoracic procedure.
- An anatomical variant was observed where the hemizygos vein drained directly into the accessory hemiazygos vein.
Advanced Usage
- "To anastomose with": In medical descriptions, the hemizygos vein is often noted to anastomose (connect) with other venous structures.
- The hemizygos vein anastomoses with the left renal vein inferiorly.
Variants and Related Words
- Hemiazygos vein: An alternative and synonymous term for the hemizygos vein.
- Accessory hemiazygos vein: A separate but related vein that drains the upper left posterior intercostal spaces and often connects to the hemizygos vein.
- Azygos vein: The major vein on the right side of the vertebral column into which the hemizygos vein typically drains.
Synonyms
- Hemiazygos vein: The most direct synonym in anatomical terminology.
- Inferior hemiazygos vein: A term sometimes used to specify its position relative to the accessory hemiazygos vein.
Related Anatomical Structures
- Azygos system: The collective term for the azygos, hemiazygos, and accessory hemiazygos veins, which form an important collateral pathway for venous return to the heart.
- Ascending lumbar vein: The vein from which the hemizygos vein originates as a continuation.
Noun
-
a continuation of the left ascending lumbar vein; crosses the midline at the 8th vertebra and empties into the azygos vein
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