Final answer:
Through the lens of an endoscope, Dr. Lorraine would see the inner lining of the duodenum, characterized by a velvety texture due to the villi. The endoscope's tiny camera and light source enable the visualization of abnormalities like ulcers and can assist in surgeries or biopsy procedures.
Step-by-step explanation:
As Dr. Lorraine examines the lining of the duodenum through the lens of an endoscope, she would see a surface with a velvety texture composed of numerous small folds called villi and microvilli. These structures greatly increase the surface area for nutrient absorption. The endoscope, equipped with a tiny camera and a light source, would transmit detailed images back to a monitor, allowing for a clear view of the duodenal mucosa and any potential abnormalities, such as inflammation, ulcers, or polyps.
The duodenum is the first section of the small intestine, just past the stomach, and can be divided into four parts: the superior, descending, horizontal, and ascending duodenum. Using the endoscope, light is sent down a fiber bundle to help illuminate the internal parts, with the reflected light transmitted back to be observed by the physician. This tool is not only for observation but can also assist in performing surgery or taking samples for further analysis. Its intricate design allows for detailed exploration of internal organs and helps detect any issues such as peptic ulcers, inflammation, or postoperative complications like the ones experienced by Roberta, mentioned in the clinical focus scenario.