Vatsapuoli

Vatsapuoli is a Finnish anatomical term that refers to the ventral surface of the body or an organ—the front or belly side. The word combines vatsa (belly) and puoli (side), and it is used to describe orientation relative to the body's long axis.

In humans and other upright-biped organisms, the vatsapuoli corresponds to the anterior or front-facing surface. In four-legged animals and many other species, it aligns with the underside or belly side. The opposite surface is the selkäpuoli, or dorsal/back side.

The term is commonly used in medical, veterinary, and biological contexts to describe location or direction. It is often interchangeable with related terms such as ventraalinen or anterior in plain language, though exact usage can vary by field and language convention. For example, structures on the vatsapuoli are those located toward the front of the body, such as portions of the abdominal wall or internal organs like the stomach and intestines.

Vatsapuoli is a general descriptor of orientation and does not specify depth or distance; those aspects are described with additional anatomical terms. It is most useful when contrasting with the dorsal or back side, and it helps situate anatomical relationships in descriptions, imaging, and surgical planning.