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1. Veins of the trunk
   1. Superior vena cava
      1. Brachiocephalic
         1. Subclavian v.
         2. Internal jugular v.
         3. Vertebral v.
            1. External vertebral venous plexus
               1. Internal vertebral venous plexus (radicular veins [L. root])
         4. 1st intercostal v.
         5. Internal thoracic v.
         6. Inferior thyroid v.
         7. Left superior intercostal v.
         8. Pericardiacophrenic v.
      2. Azygos (arch) (G. without a yoke, unpaired)
         1. Posterior intercostal veins
         2. Right superior intercostal v.
         3. Esophageal veins
         4. Hemiazygos v.
            1. Left ascending lumbar v.
               1. Left lumbar v.
            2. Left subcostal v.
            3. Left lumbar azygos v.
            4. L. posterior intercostals veins
         5. Accessory hemiazygos v.
         6. Right ascending lumbar v.
         7. Right lumbar v.
         8. Right subcostal v.
         9. Right lumbar azygos v.
   2. Cardiac
      1. Coronary sinus (starts where the posterior vein of the left ventricle drains into the great cardiac vein)
         1. Great cardiac v.
         2. Posterior vein of the left ventricle
         3. Middle cardiac v.
         4. Small cardiac v.
      2. Anterior cardiac veins
   3. Pulmonary
      1. Inferior left
      2. Superior left
      3. Inferior right
      4. Superior right
   4. Inferior vena cava
      1. Common iliac v.
         1. External iliac v.
            1. Inferior epigastric v.
            2. Deep circumflex iliac v.
            3. Femoral vein
               1. Superficial epigastric v.
         2. Internal iliac vein
            1. Superior gluteal v.
            2. Inferior gluteal v.
            3. Obturator v.
            4. Lateral sacral v.
            5. Internal pudendal v.
               1. Inferior rectal v.
                  1. Rectal venous plexus
            6. Middle rectal v.
               1. Rectal venous plexus
            7. Uterine v.
               1. Uterine venous plexus (female)
            8. Vesical v.
               1. Prostatic venous plexus (male)
                  1. Deep dorsal vein of penis (male)
               2. Vesical plexus
                  1. Deep dorsal vein of clitoris (female)
            9. Median sacral v.
      2. Renal v.
         1. Segmental veins
         2. Left gonadal v.
         3. Suprarenal (Inferior phrenic) v.
      3. Right inferior phrenic v.
      4. Right suprarenal v.
      5. Right testicular (ovarian) v.
         1. Pampiniform plexus (male) (L. pampinus, a tendril + forma, form)
      6. Hepatic veins (right, middle & left)
         1. Central veins (from sinusoids)
         2. Hepatic portal vein (via central and sinusoids)
            1. Superior mesenteric v.
               1. Right gastro-epiploic v.
               2. Pancreaticoduodenal v.
               3. Jejunal veins
               4. Ileal veins
               5. Ileocolic v.
               6. Right colic v.
               7. Middle colic v.
            2. Splenic vein
               1. Short gastric veins
               2. Left gastro-epiploic v.
               3. Pancreatic veins
               4. Inferior mesenteric v.
                  1. Left colic v.
                  2. Sigmoid veins
                  3. Superior rectal v. (rectal venous plexus)
            3. Left gastric v.
            4. Right gastric v.
            5. Para-umbilical v.
            6. Cystic v.
      7. Lumbar veins

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