Which structure precedes the thoracic duct in the described drainage sequence?

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Multiple Choice

Which structure precedes the thoracic duct in the described drainage sequence?

Explanation:
The key idea is that the lymph from the lower body gathers in a reservoir called the cisterna chyli, and this sac then continues as the thoracic duct as it ascends to the left venous angle. So, in the drainage sequence that leads into the thoracic duct, the cisterna chyli is the structure immediately before it. The lumbar and pelvic lymph nodes feed into trunks that drain into the cisterna chyli, and the thoracic duct is the direct continuation of that cisterna chyli, not a step that comes before it.

The key idea is that the lymph from the lower body gathers in a reservoir called the cisterna chyli, and this sac then continues as the thoracic duct as it ascends to the left venous angle. So, in the drainage sequence that leads into the thoracic duct, the cisterna chyli is the structure immediately before it. The lumbar and pelvic lymph nodes feed into trunks that drain into the cisterna chyli, and the thoracic duct is the direct continuation of that cisterna chyli, not a step that comes before it.

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