[Gastropoda] Liver, gonad, heart, sexual glands and kidneys grouped together. Visceral nucleus is used for the structure in Heteropoda, where the organs are concentrated into one small area; for other groups usually visceral mass is used.

[Pteropoda] Liver, gonad, heart, sexual glands and kidneys grouped together (Desmopterus in oral view).

Alternative form for Visceral nucleus : visceral mass.