The hippocampus is important in short-term memory formation. Patients who have damage to this area lose the ability to retain new information but usually retain old memories. The testis is the male generative organ, producing sperm cells and the male sex hormone, testosterone. So, when you testify you are witnessing to the truth. Orchis is the Greek name for the testis.
Anatomical terms use the Latin form as in testicular artery and vein.
The problem with eponyms is that they do not give you any information as to what or where is the structure. He is known as the Father of Anatomy. Within the cranium the veins, actually venous sinuses, come together at the back of the skull in a structure called the confluence of the sinuses. This cavity has four large veins radiating from it, supposedly, resembling the spigots that pour dark purple juice out of the four sides of the ancient wine press used to squeeze grapes with a handled screw on the top. The same stem is found in common words such as torture and tortuous.