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ansa sub·cla·via | \ ˈan-sə-ˌsəb-ˈklā-vē-ə 
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\Medical Definition of ansa subclavia
: a nerve loop that connects the middle and inferior cervical ganglia and passes around the subclavian artery The ansa subclavia (sympathetic nerves) curl around the [subclavian] artery to lie both anterior and posterior to it. — Robert H. Whitaker and Neil R. Borley, Instant Anatomy, 4th edition, 2010
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