Adverb
in a ventral location or direction
Source: WordNetThese muscles are called sonic muscle fibers, and run horizontally along the fish's body on both sides around the swim bladder and are connected to a central tendon which surrounds the swim bladder ventrally. Source: Internet
In later forms, each pair of fins became ventrally connected in the middle when scapulocoracoid and pubioischiadic bars evolved. Source: Internet
The male's posterior end is curved ventrally and has a bluntly pointed tail. Source: Internet