What are the segments of the liver called?
What are the segments of the liver called?
The four segments of right liver are: V (right anteroinferior); VI (right posteroinferior); VII (right posterosuperior) and VIII (right anterosuperior). The caudate lobe is often called an independent segment. Three vertical planes and a transverse plane divide the liver into four sectors and eight segments.
What are the 4 segments of the liver?
Right lobe
- Segment V is the most medial and inferior.
- Segment VI is located more posteriorly.
- Segment VII is located above segment VI.
- Segment VIII sits above segment V in the superio-medial position.
How many segments are in the liver?
eight
Couinaud classification. The Couinaud classification of liver anatomy divides the liver into eight functionally indepedent segments. Each segment has its own vascular inflow, outflow and biliary drainage.
What are the surgical segments of liver?
Table 1
| Couinaud Segments | Anatomic Term | Surgical Resection Term |
|---|---|---|
| 2–4 | Left liver | Left hepatectomy |
| 5,8 | Right anterior section/sector | Right anterior sectionectomy/sectorectomy |
| 6,7 | Right posterior section/sector | Right posterior sectionectomy/sectorecomty |
| 4 | Left medial section | Left medial sectionectomy |
How do you remember liver segments?
The segments are represented by the following:
- segment 1: (caudate): the thumb, in the palm of the hand.
- segment 2: index finger proximal phalanx.
- segment 3: index finger middle phalanx.
- segment 4a: middle finger proximal phalanx.
- segment 4b: middle finger middle phalanx.
- segment 5: ring finger middle phalanx.
What is segment 7 of the liver?
segment 7 (VII) is located above the portal plane to the right of the right hepatic vein. segment 8 (VIII) is located above the portal plane between the middle and right hepatic veins.
What is Segment 6 of liver?
segment 6 (VI) is located below the portal plane to the right of the right hepatic vein. segment 7 (VII) is located above the portal plane to the right of the right hepatic vein. segment 8 (VIII) is located above the portal plane between the middle and right hepatic veins.
How can I remember my liver lobes?
Liver Segments Explained with Mnemonic
- Cantle’s line: run from middle of gall bladder fossa anterior to Inferior venacava posteriorly.
- Left lobe = Segment I-IV (Segment I is separately the caudate lobe)
- Right lobe = Segment V-VIII.
Where is segment 4b of the liver?
Anatomists often label segment 4b as the quadrate lobe. This lobe is externally bounded by the gallbladder fossa on the right, the umbilical fossa on the left, the anterior border of the liver below and the porta hepatis above.
What is segment 4b of the liver?
The middle hepatic vein divides the liver into left and right lobes. The left hepatic vein divides the left lobe into lateral (2, 3) and medial (4a, 4b) segments. The right hepatic vein divides the right lobe into anterior (5, 8) and posterior (6, 7) segments.
What is segment V of liver?
segment 5 (V) is located below the portal plane between the middle and right hepatic veins. segment 6 (VI) is located below the portal plane to the right of the right hepatic vein.
Where is Section 4a of the liver?
left medial section
left medial section: segment 4a above and segment 4b below the portal plane. right anterior (or medial) section: segment 8 above and segment 5 below the portal plane.
Where is segment 4a in the liver?
What are the 3 zones in the liver?
Functionally, the liver can be divided into three zones, based upon oxygen supply. Zone 1 encircles the portal tracts where the oxygenated blood from hepatic arteries enters. Zone 3 is located around central veins, where oxygenation is poor. Zone 2 is located in between.
What is hepatic segment 4b?
segment 4 (IV) lies between the left and middle hepatic veins; it is subdivided into 4a (IVa) (superior) and 4b (IVb) (inferior) subsegments. easy tip: 4a is above and 4b is below the portal plane. segment 4 includes the quadrate lobe.
What is hepatic triad?
por·tal tri·ad. branches of the portal vein, hepatic artery, and the biliary ducts bound together in the perivascular fibrous capsule or portal tract as they ramify within the substance of the liver. Synonym(s): hepatic triad, triad (3)
