What term refers to the structure of the body that is associated with the navel?

The term that refers to the structure of the body associated with the navel is "umbilical." In anatomical terms, the umbilical region is the area surrounding the navel or belly button, which is the scar left after the umbilical cord is cut after birth. This region is often used as a reference point for locating other anatomical structures and is crucial in describing pain or other symptoms associated with this area.

The term "peritoneum" refers to the membrane that lines the abdominal cavity and covers the abdominal organs but is not specifically related to the navel itself. "Mesentery" refers to a fold of tissue that attaches to the intestines and holds them in place, which also does not directly pertain to the navel. "Cytoplasm" is the gel-like substance within a cell, containing various organelles, and is unrelated to any structures associated with the external body, including the navel. Hence, "umbilical" is the most appropriate term in this context.