Diagnostic Ultrasound - Abdomen and Pelvis

Liver
Segment 8
HEPATIC SEGMENTS
Segment 4A
Anatomy: Abdomen
Segment 2
Segment 7
Segment 3
Falciform ligament
Segment 6
Segment 4B
Segment 5
Segment 5
Segment 4B
Segment 6
Segment 3
Segment 1
Segment 7
Segment 2
Segment 4A
(Top) The 1st of 2 graphics demonstrating the segmental anatomy of the liver in a somewhat idealized fashion is shown. Segments are
numbered in a clockwise direction, starting with the caudate lobe (segment 1), which cannot be seen on this frontal view. The falciform
ligament divides the lateral (segments 2 and 3) from the medial (segments 4A and 4B) left lobe. The horizontal planes separating the
superior from the inferior segments follow the course of the right and left portal veins. An oblique vertical plane through the middle
hepatic vein, gallbladder fossa ,and IVC divides the right and left lobes. (Bottom) Inferior view of the liver shows that the caudate is
entirely posterior, abutting the IVC, ligamentum venosum, and porta hepatis. In this view, a plane through the IVC and gallbladder
approximately divides the left and right lobes.
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