Classification
Veins are classified in a number of ways, including superficial vs. deep, pulmonary vs. systemic, and large vs. small.
- Superficial veins
- Superficial veins are those whose course is close to the surface of the body, and have no corresponding arteries.
- Deep veins
- Deep veins are deeper in the body and have corresponding arteries.
- Communicating veins
- Communicating veins (or perforator veins) are veins that directly connect superficial veins to deep veins.
- Pulmonary veins
- The pulmonary veins are a set of veins that deliver oxygenated blood from the lungs to the heart.
- Systemic veins
- Systemic veins drain the tissues of the body and deliver deoxygenated blood to the heart.
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