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In general, mollusks have 3 body regions: a head, a visceral mass, and a foot.. The head contains the sense organs and brain, while the visceral mass contains the internal organs. The foot is the muscular lower part of the body which is in contact with the substrate.
It forms the outer wall of the mollusk's body and encloses the mollusk's visceral mass (internal organs, including the heart, stomach, intestines and gonads). In mollusks that have shells (e.g., clams, mussels, snails), the mantle is what secretes calcium carbonate to form the mollusk's shell.