Brain size and structure. The cephalopod nervous system is best described as The most advanced amongst molluscs Although snails and some other molluscs are hermaphroditic, most molluscs are either male or … The morphological and physiological adaptations that the cephalopod sensory organs and nervous system underwent during the course of evolution are briefly summarized. J. Cephalopod Nervous system. Young, the leading authority on the cephalopod nervous system in the latter half of the 20th century, divided the cephalopod brain into two regions: the supraesophageal mass and the subesophageal mass. Z. Cephalopoda Glossary A ventral view of this brain and the optic lobes can be found here . The nervous system of Cephalopods is more complex than the other invertebrates since the brain is larger than other members of grastropods. …system is attained by the cephalopods (squids, cuttlefishes, and octopuses) among the mollusks and by the insects and spiders among the arthropods. Facts about Cephalopods 9: the nervous system. Large brain; Information processing; Giant axons; Speed proportional to size; Stellate ganglia ensure coordinated, forceful contraction -> speed! This development of the brain is similar between cephalopod species although the timing of lobe formation and rearrangement … Cephalopod Sensory system. Cephalopods have large, well-developed brains, and their brain-to-body mass ratio is the largest among the invertebrates, falling between that of endothermic and ectothermic vertebrates.. The nervous system of cephalopods is the most complex of all invertebrates. “The cephalopod nervous system: what evolution has made of the molluscan design,” in The Nervous Systems of Invertebrates: An Evolutionary and Comparative Approach, eds O. Breidbach and W. Kutsch (Basel: Springer), 115–138. Get facts about butterfly fish here. As you might expect based on its skills in camouflage and avoiding predators, the octopus possesses a well-developed nervous system as well as complex sensory organs. The core of the cephalopod circulatory system is a series of three beating hearts. The nervous system emerges as distant ganglia, some of them merging and fusing later to form the cephalopod CNS (Figure 2C). The cartilaginous cranium protects the brain. Its eyes, for example, are similar to ours and possess an iris, pupil, lens and retina. First, there is a high degree of… Moreover, they have the well developed senses. Although the basic plan of these nervous systems is similar to that of the annelids, there are several advances. 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