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Identify the phrenic nerve (C3, C4, C5) as it crosses vertically, along with the ascending cervical artery, on the anterior surface of the scalenus anterior muscle. Anterior to the scalenus anterior muscle also are the subclavian vein, transverse cervical artery [superior structure], and suprascapular artery [inferior structure]. The transverse cervical,suprascapular, inferior thyroid, and ascending cervical arteries arise from the thyrocervical trunk [to be dissected in another exercise], which, in turn, is a branch of the subclavian artery.
Links and References:
Grant's: 8.4
Netter:22
Rohen/Yokochi: 178
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