A nodular swelling formed by the collection of nerve cells and nerve fibers along the peripheral nerves. A collection of nerve cells in the central nervous system is called a nucleus and is distinguished from other collections. There are two main types of ganglia: sensory ganglia and autonomic ganglia. The former includes the spinal ganglia (spinal nerves) and the corresponding ganglia of the cranial nerves (semilunar ganglia, spiral ganglia, etc.), while the latter includes the ganglia of the sympathetic trunk and other ganglia of the autonomic nervous system. The cephalic ganglion of invertebrates is also called the brain. Source : Heibonsha Encyclopedia About MyPedia Information |
末梢神経の途中にある,神経細胞および神経繊維が集まって結節状にふくらんだもの。中枢神経系における神経細胞の集合部は(神経)核と呼んで区別される。大別して感覚神経節と自律神経節の2種がある。前者には脊髄神経節(脊髄神経)とこれに相当する脳神経の神経節(半月神経節,らせん神経節など)があり,後者には交感神経幹の神経節とその他の自律神経系の神経節がある。なお,無脊椎動物の頭神経節は脳とも呼ばれる。
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