2. 下列何者於肱三頭肌內、外頭之間與橈神經伴行? (A)腋動脈(axillary artery) (B)胸背動脈(thoracodorsal artery) (C)肩胛下動脈(subscapular artery) (D)肱深動脈(profunda brachial artery)