The combining form jejun/o refers to which structure?

• A. Breast
• B. Larynx (voice box)
• C. Uterus
• D. Jejunum (second part of small intestine)

Answer: (D)

The combining form jejun/o names a specific part of the digestive tract: the jejunum, which is the middle segment of the small intestine between the duodenum and ileum. This part of the intestine is where a lot of absorption of nutrients occurs after chyme leaves the stomach. Because jejun/o designates this exact structure, it’s used to form terms like jejunal (pertaining to the jejunum), jejunostomy (creating a surgical opening into the jejunum), or jejunitis (inflammation of the jejunum). The other options refer to different structures—breast (mast/o), larynx (laryng/o), and uterus (hyster/o or uter/o)—so they don’t match the jejunum.