ansa subclavia
noun
ansa sub·cla·via
ˈan-sə-ˌsəb-ˈklā-vē-ə
: 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
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Merriam-Webster unabridged
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