Peritonitis is defined as inflammation of the peritoneum. The inflammatory response involves vasodilation, exudation of protein-rich fluid, cellular infiltration, pain and, chronically, formation of fibrous adhesion. The disease can be classified into primary and secondary cases.
It begins in the venous plexus along the medial side of the foot, and it runs up the medial side of the leg and knee, alongside the saphenous nerve. In the thigh, the long saphenous vein continues up the medial surface, accompanying the medial femoral cutaneous nerve.
Note that the deep calf veins are bifid (two veins for each artery). Click on structure or label for identification. SUPERFICIAL FEMORAL (SFV) Despite the name, this long vein segment is a deep vein. The popliteal vein becomes the SFV as it dives at the level of the adductor canal in the low thigh.