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Lymph traveling from the left arm would enter the venous circulation via the thoracic duct.

What is thoracic duct?

  • The largest lymphatic channel in the body's lymphatic system is the thoracic duct, commonly known as van Hoorne's canal.
  • Adults have an average length of 40 cm, and their abdominal origin is about 5 mm wide.
  • The thoracic duct runs from the root of the neck to the twelfth thoracic vertebra.
  • The thoracic duct enters the posterior mediastinum, remaining to the right of the vertebral column, by ascending via the diaphragm's aortic hiatus.
  • At the T7 vertebral level, it runs posterior to the esophagus before crossing over to the left side of the thorax at the T5 vertebral level.
  • The primary lymphatic channel for the return of chyle/lymph to the systemic venous system is the thoracic duct.
  • It drains lymph from the left side of the face and neck, left hemithorax, left upper limb, and both lower limbs.

Learn more about thoracic duct here:

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