Built locally from globally sourced parts

If there was ever a system the was highly under emphasized in general discussions of anatomy it is the lymphatic system.  When kids in elementary school learn basic anatomy they learn about the heart and lungs and skin and skeletal. I don't ever remember hearing about the lymphatic system in any discussions of anatomy in elementary, middle or high school. 
It's probably because the lymph system is a bit weird to understand. I think this stems from its cobbled assembly and varied functionality. The system relies on other organs to supply many of its components yet still has its own distinct pieces a well. In a way it's kind of like a Toyota Tundra: Built locally from globally sourced parts.