For the album by Brian Eno, see Nerve Net (album). Brian Peter George St John le Baptiste de la Salle Eno (born 15 May 1948 commonly known as Brian Eno (ˈiːnoʊ is an English Musician, producer
A nerve net is a type of simple nervous system that is found in members of the phylum cnidaria. The nervous system is a Network of specialized cells that communicate information about an animal's surroundings and itself A phylum ( Plural: phyla) is a Taxonomic rank between Kingdom and above Class. Cnidaria (naɪˈdɛəriə is a phylum containing some 9000 Species of Animals found exclusively in aquatic mostly marine, environments Nerve nets consist of interconnected neurons lacking a brain or any form of cephalization. Neurons (ˈnjuːɹɒn also known as neurones and nerve cells) are responsive cells in the Nervous system that process and transmit information The brain is the center of the Nervous system in animals All Vertebrates and the majority of Invertebrates have a brain Cephalization is an Evolutionary trend whereby nervous tissue, over many generations becomes concentrated toward one end of an organism This nervous system allows cnidarians to respond to physical contact. Cnidaria (naɪˈdɛəriə is a phylum containing some 9000 Species of Animals found exclusively in aquatic mostly marine, environments They may then detect food and other chemicals in a rudimentary way. Although the nerve net allows the animal to respond to its environment, it has trouble alerting the animal from where the stimulus is coming. In Physiology, a stimulus is a detectable change in the internal or external environment For this reason, simple animals with nerve nets, such as hydra, will typically respond in the same way to contact with an object, regardless of where the contact occurs. Hydra is a Genus of simple fresh-water animals possessing radial symmetry.
See also
- Insect nervous system
- Nerve chord
References
- Kass-Simon G, Pierobon P. Cnidarian chemical neurotransmission, an updated overview. Comp Biochem Physiol A Mol Integr Physiol. 2007 Jan;146(1):9-25. Epub 2006 Sep 22. PMID 17101286
- Miljkovic-Licina M, Gauchat D, Galliot B. Neuronal evolution: analysis of regulatory genes in a first-evolved nervous system, the hydra nervous system. Biosystems. 2004 Aug-Oct;76(1-3):75-87. PMID 15351132
- Koizumi O, Mizumoto H, Sugiyama T, Bode HR. Nerve net formation in the primitive nervous system of Hydra--an overview. Neurosci Res Suppl. 1990;13:S165-70. PMID 2259484
- Shimizu H. Feeding and wounding responses in Hydra suggest functional and structural polarization of the tentacle nervous system. Comp Biochem Physiol A Mol Integr Physiol. 2002 Mar;131(3):669-74. PMID 11867292
- Sakaguchi M, Mizusina A, Kobayakawa Y. Structure, development, and maintenance of the nerve net of the body column in Hydra. J Comp Neurol. 1996 Sep 9;373(1):41-54. PMID 8876461
- Gillis MA, Anctil M. Monoamine release by neurons of a primitive nervous system: an amperometric study. J Neurochem. 2001 Mar;76(6):1774-84. PMID 11259495
- Grimmelikhuijzen CJ, Westfall JA. The nervous systems of cnidarians. EXS. 1995;72:7-24. PMID 7833621
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