The structure of octopuses is different from that of most vertebrates, because they belong to invertebrates. Their heart, memory system and so on are different from most animals. Another big difference is the number of brains they have. Humans and most other animals have only one brain, but octopuses have one main brain and eight accessory brain systems, that is to say, octopuses have nine brains.
The functions and importance of these nine brains are different, which can also be seen from their names. Among them, the main brain is the most important one, located in the head of octopus. The main brain has two main functions, one is thinking, the main brain is relatively developed, making the octopus IQ is relatively high; The other is memory, because the brain is connected to a memory system. Octopuses have their parencephalon in the place of their tentacles, and they have eight tentacles, so they have eight parencephalons. The main role of the accessory brain is memory, and these eight accessory brains are connected to another memory system. Therefore, it can be said that these eight accessory brains play the role of memory and do not play the role of thinking.
As mentioned above, the structure of an octopus is very special. In addition to having nine brains, an octopus also has three hearts. One of them is the "body heart", which plays a major role in blood supply to the octopus's whole body; There are two "gill heart", they can also play a part of the role of blood supply, but their main role is not to supply blood, but to filter the waste produced by the body, from this description can be seen that the gill heart is more like the role of human kidney.
