Syennesis, the physician of Cyprus, writes as follows: 'The big veins run thus: from the eye, across the eyebrow, along the back, past the lung, in under the breasts; one from right to left, and the other from left to right; that from the left, through the liver to the kidney and the testicle, that from the right, to the spleen and kidney and testicle, and thence to the penis'.