Jellyfish is a creature of our fascination because it is not easily visible and resides in deeper parts of the ocean and due to the fluorescent color which is emitted out of jellyfish, it is an attractive creature for us.
This is just the tip of the iceberg when you’re speaking about the unusualness of jellyfish as compared to the other animals on land or even the marine creatures.
Jellyfish is entirely different in the bodily structure as well as from a scientific point of view.
If you look into the bodily structure of jellyfish you would realize that, the nervous system of the jellyfish is entirely different and this brings us to the question do jellyfish have brains?
If they have a nervous system, people might think that they have a brain as well but this is not true.
Do jellyfish have brains?
No, jellyfish do not have brains. You might be thinking that we have mentioned that jellyfish has a nervous system but how is that nervous system can control the jellyfish if it does not have a brain. This is where jellyfish is entirely different from the other creatures on land as well as in sea.
If you’re looking into the anatomy of the body of other animals you would find out that it is in symmetry. That is there is some similar organs on the left side of the body of the animals and on the right side of the body of the animals but there is no such similarity in jellyfish.
If you look into the body of jellyfish you would understand that bilaterally they are not similar at all. That is why, the way in which the body of the jellyfish operates is also different than other animals.
If you look at the picture of jellyfish, you would realize that the jellyfish does not have eyes and similarly if you look at it from a scientific point of view you would realize that the jellyfish does not have any kind of organs like the heart or the brain as well but you can only see a jelly -type semi-liquid inside it. They do not have the arteries as well as the blood flowing through them as well.
As we mentioned above, they do have a collection of nerves which forms the nervous system. This nervous system is not centralized in a single location as in the body of other animals where it is controlled by the brain. At some of the points of the body of the jellyfish, the concentration of nerves is more as compared to the other parts of the body but still it is very much less as compared to the collection of nerves near the brain of other animals.
If you look into the function of the nervous system, then you would understand that it is constantly monitoring the sensors in the body of the jellyfish and constantly sending the signals around as well and also it is sending the signals for the moment of the jellyfish as well and therefore as you can see, 2 of the most important functions of the nervous system are being carried out but without the presence of a brain.
That is why, scientists have termed this collection of nerves inside the body of the jellyfish as a nervous system irrespective of the fact that there is no brain present inside the body of the jellyfish. The most basic functions of the nervous system are still being carried out by the collection of nerves even though the brain is not present inside the body of the jellyfish.
The higher concentration of the collection of nerves inside the body of the jellyfish is at the bell. You can in some ways say that this is the central part of the nervous system but since there is no presence of brain you cannot specifically recognize the region as the central part of the nervous system. Since jellyfish is a invertebrate, this type of nervous system exists in it.
The type of nervous system which is present inside the jellyfish is in the form of the ring so that the signals can be easily transmitted inside the nervous system. This is often seen in the invertebrate creatures but even by the standards of the invertebrate creatures, the nervous system which is present in the jellyfish is much more advanced as compared to the other invertebrate creatures.
The type of the nervous system which is present in the jellyfish was 1st discovered in 1965 and therefore since then there has been a considerable amount of research to find out more about the nervous system of the jellyfish and to compare it with the other similar creatures.
Even though you might be thinking that the nervous system of the jellyfish is primitive but it is not because it is actually very much advanced and with such a limited nervous system as well, it can easily detect the light as well as the temperature as well as the direction of motion and therefore enabling the jellyfish to move in the direction in which it wants to move quite easily.
The ring type nervous system, is good enough for the jellyfish to carry out the normal functions like consuming food and moving around and reproducing and it also enables the jellyfish to sense the surrounding in more ways than one and thereby enabling it to catch its prey and consume it when possible.
So, no, jellyfish do not have brains but they are able to carry on the normal functions to continue with their life using a ring type nervous system which is present in the body of the jellyfish which enables them to reproduce as well as to eat as well as to move around the water and detect the light and control the motion of the jellyfish as well, thereby enabling it to carry on all the normal functions which are needed for a normal life in water through which they have been able to survive for centuries.