…As a result, nerve fibers cross between the anterior rami of the spinal nerves, forming a kind of network. This is called a nerve plexus (or nerve collection network). In humans, such plexuses include the cervical plexus (formed by the anterior rami of the first to fourth cervical nerves), the brachial plexus (formed mainly by the anterior rami of the fifth cervical nerve to the first thoracic nerve), the lumbar plexus (formed mainly by the anterior rami of the twelfth thoracic nerve to the fourth lumbar nerve), the sacral plexus (formed mainly by the anterior rami of the fourth lumbar nerve to the third sacral nerve), the pudendal plexus (formed mainly by the anterior rami of the second to fourth sacral nerves), and the coccygeal plexus (formed mainly by the anterior rami of the fourth and fifth sacral nerves and the coccygeal nerve). … *Some of the terminology explanations that mention "plexus" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…このため,脊髄神経前枝の間に神経繊維の交錯を生じ,一種のネットワークができる。これを神経叢(または神経集網)plexusという。このような神経叢として,ヒトでは頸神経叢(第1頸神経から第4頸神経までの前枝によって形成される),腕神経叢(主として第5頸神経から第1胸神経までの前枝によって形成),腰神経叢(主として第12胸神経から第4腰神経までの前枝によって形成),仙骨神経叢(主として第4腰神経から第3仙骨神経までの前枝によって形成),陰部神経叢(主として第2から第4までの仙骨神経の前枝によって形成),尾骨神経叢(主として第4および第5仙骨神経と尾骨神経の前枝によって形成)がある。… ※「plexus」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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