It is called a nerve net .
A nerve net or diffused nervous system is called simple nervous system as present in cnidarians .
No, cnidarians such as hydra don't have a centralized nervous system, theirs is rather diffuse. They have neither brain nor ganglia.
cnidarians have no nervous system
The nervous system. Cnidarians have a neural net, but porifera do not.
Nervous responses in Cnidarians are controlled by a diffuse web of interconnected nerve cells called a nerve net.
interneurons carry out the integrative function of the nervous system.
Its called a nerve net, like a nervous system but not as good.
The characteristic that gives cnidarians their name is: cnidarian means "nettle" and nettles are plants that release stinging barbs into the skin. All cnidarians have stinging cell's. Cnidarians have complex tissues, a gut for digesting food, and a nervous system.
All cnidarians have on their tentacles stinging cells called nematocytes. They have no brains or a central nervous system. Another common feature is that they all can regenerate, letting them produce asexually (without the need for another partner) and to recover from injury.
The Sympathetic Nervous System
Autonomic nervous system
The enteric nervous system is usually called the intestinal nervous branch of the nervous system. It regulates the digestive system.