Final answer:
The basilic vein is less preferred for venipuncture because of its higher risk of bruising and its proximity to nerves and arteries that could be damaged during the procedure.
Step-by-step explanation:
The basilic vein is the third choice for venipuncture in the arm because it is more prone to bruising and is in closer proximity to nerves and arteries that could potentially be harmed during the venipuncture process. This vein, part of the superficial venous network of the arm, arises from the palmar venous arches and intersects with the median cubital vein. It parallels the ulnar vein, is more medial in location, and continues into the upper arm, leading to the axillary vein. The median cubital vein, a more preferred site for venipuncture due to its accessibility and reduced risk of complications, forms a connection between the cephalic vein and the basilic vein, making it a primary location for drawing blood.