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The mollusca, most notably known as the Octopus, has a considerably complex and complicated nervous system, depending on the type of species. Since the Octopus is arguably the most intelligent of the invertebrates, their nervous system is quite elaborate. The Phylum Mollusca has no true nervous system in comparison to other organisms, but rather it has many ganglia that control the body and conduct impulses.The Mollusca has two main types of nerve cords; one serving the internal organs, and the other serving for the foot of the organism. The nerve cord that serves for the Mollusca's internal organs are called visceral cords, whereas the cords serving for the foot are called pedal cords. There are many ganglia scattered throughout a Mollusca's body, mainly serving as control centers in vital organs of the body. Ganglia throughout the body are bound together by large bundles of nerves, called commissures. The cerebral ganglia serves as the messenger for the Mollusca, handling all messages to and from the eyes. The cerebral ganglia is vital for the organism to be able to move around and interact with their envirnonments. The other type of ganglia in the Mollusca are the pedal ganglia, which control the actions of the foot. The cerebral and the pedal ganglia work hand-in-hand with one another, as they communicate with one another in response to vibrations or any other encounters the Mollusca may face. There are thousands of types of organisms within the phylum mollusca, ranging from snails and squids, to clams and chitons. With this large range of species, various types of species have different body parts. For those that have one, the brain is a crucial part of the nervous system in regard to the overall movement and reactions of these organisms. When present, the brain allows the Mollusca to recognize touch, vibration and detect chemicals, because of their pair of sensor-containing tentacles. The Mollusca's nervous system is quite elaborate and complex, but essential when examining the types of animals within the phylum.