Caudate lobe

The caudate lobe (lobus caudatus; Spigelian lobe) is situated upon the posterior surface of the right lobe of the liver, opposite the tenth and eleventh thoracic vertebræ. It is bounded, below, by the porta; on the right, by the fossa for the inferior vena cava; and, on the left, by the fossa for the ductus venosus. It looks backward, being nearly vertical in position; it is longer from above downward than from side to side, and is somewhat concave in the transverse direction.

The caudate process is a small elevation of the hepatic substance extending obliquely lateralward, from the lower extremity of the caudate lobe to the under surface of the right lobe. It is situated behind the porta, and separates the fossa for the gall-bladder from the commencement of the fossa for the inferior vena cava.

The papillary process is located opposite to the caudate process of the liver, at the left lower angleof the caudate lobe.

Varying from sources, it is not clear if the quadrate and caudate lobes. belong to the right lobe of liver (in Gray's for example) or if these two lobes may be considerate as separated lobes like in the Terminologia Anatomica 1&2.