The fourth pair extend from the front part of the head and the eyes in underneath the neck and the collar bones; from thence they stretch on through the upper part of the upper arms to the elbows and then through the fore arms on to the wrists and the jointings of the fingers, and also through the lower part of the upper arms to the armpits, and so on, keeping above the ribs, until one of the pair reaches the spleen and the other reaches the liver; and after this they both pass over the stomach and terminate at the penis'.