Anatomy can be grouped into gross anatomy and superficial anatomy. Gross anatomy is the study of structures that are visible to the human eye i.e. without the aid of a microscope. The anatomical regions are those regions in the body that are easily seen by the unaided eye.
In this case, Luna is trying to study the name and locations of the lumbar, or lower back, area of the body. The lumbar is the vertebrae found at the lower back of the body. Hence, it is an easily visible internal structure when dissected, making it's study a form of GROSS ANATOMY.
