Editing Anatomy (section)

===Nervous tissue===
{{See also|Neuroanatomy}}
[[Nervous tissue]] is composed of many nerve cells known as [[neuron]]s which transmit information. In some slow-moving [[radially symmetrical]] marine animals such as [[ctenophore]]s and [[cnidarian]]s (including [[sea anemone]]s and [[jellyfish]]), the nerves form a [[nerve net]], but in most animals they are organized longitudinally into bundles. In simple animals, receptor neurons in the body wall cause a local reaction to a stimulus. In more complex animals, specialized receptor cells such as [[chemoreceptor]]s and [[photoreceptor cell|photoreceptors]] are found in groups and send messages along [[biological neural network|neural networks]] to other parts of the organism. Neurons can be connected together in [[ganglia]].<ref name=Ruppert104>{{cite book |title=Invertebrate Zoology, 7th edition |last1=Ruppert |first1=Edward E. |last2=Fox |first2=Richard, S. |last3=Barnes |first3=Robert D. |year=2004 |publisher=Cengage Learning |isbn=978-81-315-0104-7 |page=104 }}</ref> In higher animals, specialized receptors are the basis of sense organs and there is a [[central nervous system]] (brain and spinal cord) and a [[peripheral nervous system]]. The latter consists of [[Sensory neuron|sensory nerves]] that transmit information from sense organs and [[motor nerves]] that influence target organs.<ref>{{cite book|title=Grey's Anatomy: Descriptive and Applied |year=1944 |edition=28 |page=1038 |publisher=Langmans |editor1-last=Johnston | editor1-first= T.B |editor2-last=Whillis | editor2-first=J }}</ref><ref name=Ruppert107>{{cite book |title=Invertebrate Zoology, 7th edition |last1=Ruppert |first1=Edward E. |last2=Fox |first2=Richard, S. |last3=Barnes |first3=Robert D. |year=2004 |publisher=Cengage Learning |isbn=978-81-315-0104-7 |pages=105–107 }}</ref> The peripheral nervous system is divided into the [[somatic nervous system]] which conveys sensation and controls [[voluntary muscle]], and the [[autonomic nervous system]] which involuntarily controls [[smooth muscle]], certain glands and internal organs, including the [[stomach]].<ref>{{cite web | url=https://www.inkling.com/read/essential-clinical-anatomy-keith-moore-4th/introduction-to-clinical-anatomy/nervous-system | title=Essesntial Clinical Anatomy | publisher=Inkling | work=Nervous System | date=2010 | edition=4th | access-date=30 April 2014 | author1=Moore, K. | author2=Agur, A. | author3=Dalley, A. F. | archive-date=8 March 2021 | archive-url=https://web.archive.org/web/20210308131326/https://www.inkling.com/read/essential-clinical-anatomy-keith-moore-4th/introduction-to-clinical-anatomy/nervous-system | url-status=live }}</ref>