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In other words, there are no ganglia. These arms transport food captured by the tentacles into the mouth. The jellyfish detects various stimuli through the nerve net. These structures function as a The traditional view of the cnidarian nervous system is of a diffuse 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. (dense balls of nerve cells) each associated with one rhopalium, and they also have a nerve net. An elementary nervous system, or nerve net, allows jellyfish to smell, detect light, and respond to other stimuli. Their nervous system and rhopalia (a small sensory nerve that most Scyphozoa have) allow them to perceive stimuli, such as light, odor and allows them to respond quickly.The jellyfish has a series of interconnected nerve cells called a nerve net. Lacking a brain, jellyfish instead have a elementary nerve net capable of detecting light, odor and other stimuli and coordinating the animal’s responses. 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. In Jellyfish do not have brain, they have a distributed nervous system called a nerve net. The simple digestive cavity of a jellyfish acts as both its stomach and intestine, with one opening for both the mouth and the anus. The hydra does have specialized cells for touch and chemical detection. In cnidarians the neurons are joined to epithelial receptors and to contractile cells. 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. The answer is nerve net. This nerve net is basically scattered neurons … The nerve net is concentrated around the mouth. 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. Jellyfish. Some jellyfish may have sensory structures, motor nerve net, and diffuse nerve net. 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. Moon Jellyfish lack basic sensory organs and a brain. 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 a simple digestive cavity with four to eight oral arms near the mouth. Unlike higher animals, the hydra does not have any grouping of nerve cell bodies. The epidermis cells contain nerves that are loosely set in a network known as the “nerve net”. Jellyfish has a nerve net that surrounds its whole body. 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