Final answer:
An oblique section is made by slicing through a structure at an angle, which is unlike the longitudinal, sagittal, or cross sections that have specific directional cuts.
Step-by-step explanation:
If a tubular vessel like the duct of a salivary gland were cut on an angle or creating an oval, that cut would be called an oblique section. Unlike longitudinal, sagittal, or cross sections, an oblique section is made by slicing through the structure at an angle. This is different from a longitudinal section, which runs along the length of a structure, a sagittal section which separates left and right parts, a cross section which is perpendicular to the long axis creating upper and lower parts, and a coronal or frontal section which divides the body into front and back portions.