Structure K is the:

Structure K is the:

• A. Rugae
• B. Haustra
• C. Pylorus
• D. Incisura angularis

Answer: (B)

Haustra are the sacculations seen along the colon, formed by the longitudinal taeniae coli. On radiographs of the large intestine (such as a barium enema), the colon displays these evenly spaced pouch-like protrusions, giving it a segmented appearance. This characteristic pattern is why Structure K is identified as haustra. Rugae are folds of the stomach lining, not a feature of the colon's wall; the pylorus is the stomach's outlet to the duodenum, and the incisura angularis is a notch on the stomach’s lesser curvature. So the presence of these colon-like sacculations points to haustra.

Haustra are the sacculations seen along the colon, formed by the longitudinal taeniae coli. On radiographs of the large intestine (such as a barium enema), the colon displays these evenly spaced pouch-like protrusions, giving it a segmented appearance. This characteristic pattern is why Structure K is identified as haustra. Rugae are folds of the stomach lining, not a feature of the colon's wall; the pylorus is the stomach's outlet to the duodenum, and the incisura angularis is a notch on the stomach’s lesser curvature. So the presence of these colon-like sacculations points to haustra.