Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The clavipectoral triangle (also known as the deltopectoral triangle) is an anatomical region found in humans and other animals. It contains the cephalic vein, and deltopectoral fascia, which is a layer of deep fascia that invests the three structures that make up the border of the triangle, and also the cephalic vein in the triangle. The subclavian vein and the subclavian artery may be accessed via this triangle, as they are deep to it.