Final answer:
The paired veins that form a jugular venous arch through an anastomosis in the suprasternal space are the Anterior jugular veins, which drain into the subclavian veins, and not the internal, external jugular, or vertebral veins.
Step-by-step explanation:
The paired veins that anastomose through a fascial suprasternal space in a jugular venous arch are the Anterior jugular veins. These veins are involved in draining the front of the neck and eventually empty into the subclavian veins, juxtaposing the highly proximate internal and external jugular veins, which drain blood from the brain, superficial regions of the head and scalp. The anterior jugular veins connect via an anastomosis across the midline in the suprasternal space to form this venous arch.
The brachiocephalic vein is formed from the fusion of the subclavian vein with the external and internal jugular veins. The brachiocephalic vein also receives blood from the vertebral veins and the internal thoracic veins, playing a critical role in the venous return from the upper thoracic region to the superior vena cava. However, it is specifically the anterior jugular veins that form the jugular venous arch through anastomosis at the suprasternal space.