It is accompanied by venae comitantes (accompanying veins). In the right atrium, the stretch receptors occur at the junction of the venae cavae. The fibular artery is accompanied by small veins (venae comitantes) known as fibular veins. The largest veins in the human body are the venae cavae. They are the venae comitantes of the internal pudendal artery. The ethmoidal veins are the venae comitantes of the ethmoidal arteries. In anatomy, the ulnar veins are venae comitantes for the ulnar artery. Larger arteries, on the other hand, generally do not have venae comitantes. This "arch of the azygos vein" ("arcus venae azygos") is an important anatomic landmark. Venae comitantes are usually found with certain smaller arteries, especially those in the extremities.