In fact, it is not the absence of venous valves but the existence of communications between the facial vein and cavernous sinus and the direction of blood flow that is important in the spread of infection from the face.
12.
Although there are descriptions of the use of thumb lancets in horses for opening the facial vein and for bleeding cats and dogs, the dimensions of the lancets fitted into fleams fit the dimensions of those described by Kirkup for human use.
13.
One problem, says Dr . Joseph Iovino, director of the South Shore vein center, is that the chemicals can travel to the brain if injected into facial veins anywhere in the triangle between a point midway between the eyebrows and the corners of the mouth.
