13.下列何者可在頸後三角(posterior triangle of the neck)內觀察到？
(A)顏面動脈(facial artery)由頸外動脈發出
(B)表淺處之皮膚底下即是迷走神經(vagus nerve)
(C)頸神經叢的分支(branches of cervical plexus)
(D)肩胛舌骨肌上腹(superior belly of omohyoid muscle)

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統計： A(0), B(0), C(2), D(0), E(0) #3975892