The nerve net, or plexus, is a network of neurones (not true nerves) that cover the subumbrella (and sometimes a nerve net or plexus that covers the exumbrella) just beneath the surface. The nerve net is concentrated around the mouth. It makes a series of interconnected neurons that form net-like structure. The second nerve net is the “Small Nerve Net.” You can see pictures of it from three different species below. Jellyfish nervous system The jellyfish has a very simple nervous system and it is believed that it is from them that the first nervous system evolved. (dense balls of nerve cells) each associated with one rhopalium, and they also have a nerve net. The light signals are sent to the jellyfish’s rudimentary nervous system, which looks like a net, so researchers cleverly called it a nerve net. An elementary nervous system, or nerve net, allows jellyfish to smell, detect light, and respond to other stimuli. The jellyfish detects various stimuli through the nerve net. The traditional view of the cnidarian nervous system is of a diffuse The Large Nerve Net is packed around the muscle that lines the underside of the jelly, and basically this nervous system coordinates puling, turning the whole animal into a big beating heart. Slightly more complex jellyfish have a nerve ring, a set of nerves that border the jellyfish’s bell, its floaty head-like structure. Jellyfish have no lungs, stomach or intestine as the oxygen and the nutrients flow into and out of the body directly through the gastrodermis or the outer body cells. In other words, there are no ganglia. In cnidarians the neurons are joined to epithelial receptors and to contractile cells. The answer is nerve net. Unlike higher animals, the hydra does not have any grouping of nerve cell bodies. Lacking a brain, jellyfish instead have a elementary nerve net capable of detecting light, odor and other stimuli and coordinating the animal’s responses. These arms transport food captured by the tentacles into the mouth. Nerve net, primitive nerve arrangement forming the entire nervous system of many cnidarians and a part of more advanced nervous systems. This nerve net is basically scattered neurons … The hydra does have specialized cells for touch and chemical detection. In It is then the nerve net's job to transmit this information around a circular nerve ring, through the rhopalial lappet (small sensory structures located at the rim of the jellyfish's body), and to other nerve cells. The epidermis cells contain nerves that are loosely set in a network known as the “nerve net”. Moon Jellyfish lack basic sensory organs and a brain. The simple digestive cavity of a jellyfish acts as both its stomach and intestine, with one opening for both the mouth and the anus. Jellyfish do not have brain, they have a distributed nervous system called a nerve net. Jellyfish. Jellyfish has a nerve net that surrounds its whole body. 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