Final answer:
The clotting cascade originating from within the blood itself is known as the intrinsic pathway, which, along with the extrinsic pathway, leads to the common pathway ending in blood clot formation.
Step-by-step explanation:
The clotting cascade that originates from within the blood itself is called the intrinsic pathway. This complex sequence is initiated by internal factors, such as damage to the vessel walls or contact with foreign substances that activate factor XII (Hageman factor). The intrinsic pathway involves several clotting factors that are present within the bloodstream and leads to the activation of factor X, which links to the common pathway and culminates in the formation of a blood clot. The intrinsic pathway, along with the extrinsic pathway (usually triggered by trauma), merges into the common pathway, in which fibrin is produced to seal off the vessel, resulting in coagulation. Clotting factors, relying on substances like calcium ions and vitamin K, play a crucial role in this process.