[2] A line can be imagined running from the left of the vena cava and all the way forward to divide the liver and gallbladder into two halves.

An important anatomical landmark, the porta hepatis, also known as the transverse fissure of the liver, divides this left portion into four segments, which can be numbered in Roman numerals starting at the caudate lobe as I in an anticlockwise manner.

The ligamentum teres hepatis turns around the inferior margin of the liver to come out ventral in the falciform ligament.

The quadrate lobe is an area of the liver situated on the undersurface of the medial segment left lobe (Couinaud segment IVb), bounded in front by the anterior margin of the liver, behind by the porta hepatis, on the right by the fossa for the gall-bladder, and on the left by the fossa for the umbilical vein.

The caudate lobe of the liver is bounded below by the porta hepatis, on the right by the fossa for the inferior vena cava, and on the left by the fossa for the ductus venosus and the physiological division of the liver, called the ligamentum venosum.

The caudate lobe is named after the tail-shaped hepatic tissue (cauda; Latin, "tail") papillary process of the liver, which arise from its left side.

[7] Besides, the caudate lobe also derives its supply from the right and left branches of the portal vein.

[8] This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)