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The course of the radial artery in the forearm is represented by a line drawn from the middle of the bend of the elbow to the radial pulse, just to the inner side of the base of the styloid process of the radius, 1899. From 'The Treatise of the Human Anatomy and Its Applications to the Practice of Medicine and Surgery, Volume I' (1899). In the middle of the arm, the radial nerve lies in relation with the outer side of the artery. When ligating the artery in the lower third of the forearm, the incision is made along the line of the artery, between and parallel with the tendons of the supinator longus and flexor carpi radialis muscles. (Photo by VintageMedStock/Getty Images)