Relating to or involving both the duodenum and the jejunum, which are two connected sections of the small intestine.
From duodenum plus jejun- (from Latin jejunus, 'empty' or 'fasting') plus the adjectival suffix -al. The jejunum was named because it appears empty during dissections, as food moves quickly through it.
The duodenojejunal angle is actually a critical anatomical landmark surgeons use—it marks the exact spot where the duodenum ends and the jejunum begins, and many surgeries need to preserve this junction to maintain proper digestion.
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