Transillumination of dissected carotid artery for intravital videomicroscopy. (A) The Doppler flow probe (labeled D) is positioned proximal to the bifurcation of the carotid artery (labeled C), with the artery in the flow probe's groove. The transilluminator (labeled T) is placed along side the artery, proximal to the flow probe so that the vessel is transilluminated from below (B).