Anterior: Refers to the front (frontal plane) of or abdominal portion of the body. Note: In official anatomical nomenclature the terms anterior and ventral are used in reference to the ventral or belly surface of the body. When speaking about the trunk of the body, the term anterior or ventral can be used to mean "in front of." However, for parts of the head, the ventral structure is the underside or the side nearer to the belly. For instance, the ventral surface of the brain is the lower surface.