The cephalic vein drains into the external jugular vein via the ________ vein.

A) brachial
B) transverse scapular
C) radial
D) ulnar

The cephalic vein travels up the arm and passes through the deltopectoral triangle, where it then drains into the axillary vein. However, before it reaches the axillary vein, it often joins with the basilic vein to form the axillary vein. The external jugular vein is not directly connected to the cephalic vein. Instead, the cephalic vein contributes to the formation of the subclavian vein, which then leads to the external jugular vein via the transverse scapular vein. Therefore, the correct answer is B - transverse scapular vein.