The word "capital" derives from the Latin "caput" (genitive "capitis"), meaning 'head'. Other contributing muscles include the supraspinatus muscle and biceps brachii muscle caput longum. Dilation of this particular portacaval anastomosis results in what is referred to as caput medusae. This leads to a condition called Caput medusae. In arachnology, the "caput" or "head" is the cephalic part of a cephalothorax. It has a ruined mediaeval castle which was the "caput" of a large feudal barony. Robert fitz Martin established the caput of his barony at Nanhyfer or Nevern. From that time it was the "caput" of the Feudal barony of Dunster. It may be a derivation from "caput" "head". It was the "caput" of the feudal barony of Trematon. Germanicus next marched on Mattium (caput gentis) and burned it to the ground. The Lordship's "caput" was Trim Castle. The caput is not deeply and tightly held by the acetabulum. Instead the Byzantines landed at Caput Vada, away from Carthage. They landed at Caput Vada (modern Ras Kaboudia) in modern Tunisia.