Nervous Mollusks
The phylum of mollusca covers such a wide range of organisms with different body structures that it is difficult to classify the whole group as a whole. As a result of this, many textbooks generalize the nervous systems, and other body systems as well, of mollusks. The body structure of mollusks generally consists of a shell, and one muscular "foot" underneath the organism. The main nervous structure of a mollusk consists of a pair of nerve cords, which do most of the work in the system.