The cartilaginous cranium protects the brain. 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 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 … 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. This development of the brain is similar between cephalopod species although the timing of lobe formation and rearrangement … 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. Get facts about butterfly fish here. Large brain; Information processing; Giant axons; Speed proportional to size; Stellate ganglia ensure coordinated, forceful contraction -> speed! “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. Its eyes, for example, are similar to ours and possess an iris, pupil, lens and retina. Z. Cephalopod Nervous system. The octopus is excellent at spotting prey and reaching to just the right spot to snag it. The core of the cephalopod circulatory system is a series of three beating hearts. First, there is a high degree of… Brain size and structure. Cephalopod Sensory system. Cephalopoda Glossary A ventral view of this brain and the optic lobes can be found here . Cephalopods (squid, octopus and cuttlefish) have the largest brain of all invertebrates, a distributed nervous system capable of instantaneous camouflage and sophisticated behaviors, a unique body plan, and the ability to extensively recode their own genetic information within messenger RNA, along with other distinctive features. Moreover, they have the well developed senses. The nervous system emerges as distant ganglia, some of them merging and fusing later to form the cephalopod CNS (Figure 2C). …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. J. The nervous system of Cephalopods is more complex than the other invertebrates since the brain is larger than other members of grastropods. 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