What are the two main lymphatic ducts in the body?

The two main lymphatic ducts in the body are the right lymphatic duct and the thoracic duct. The right lymphatic duct is responsible for draining lymph from the right upper quadrant of the body, which includes the right arm, right side of the head and neck, and the right thoracic region. The thoracic duct, on the other hand, drains lymph from the rest of the body, including the left side of the head and neck, the left arm, and the lower body.

Both ducts play a critical role in the lymphatic system by returning lymph to the bloodstream, maintaining fluid balance, and participating in immune functions. The anatomy and functions of these ducts are fundamental to understanding how lymphatic drainage and fluid homeostasis occur in the body.