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A plexus (from the Latin for "braid") is a branching network of vessels or nerves. The vessels may be blood vessels (veins, capillaries) or lymphatic vessels. The nerves are typically axons outside the central nervous system. Although many medical words ending in ''-us'' that came to English from Latin have the plural suffix ''-i'' (and the plural form plexi indeed does exist in Latin), English does not use the ''-us/-i'' pattern for this particular term; the standard plural form in English is plexuses. ==Plexuses== *Nervous plexus ::The four primary nerve plexuses are the cervical plexus, brachial plexus, lumbar plexus, and the sacral plexus. *Choroid plexus ::The choroid plexus is a part of the central nervous system in the brain and consists of capillaries, ventricles, and ependymal cells. *Venous plexus *Cardiac plexus 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Plexus」の詳細全文を読む スポンサード リンク
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