IMG_1861.jpg
Explain this simply
Here's a simple breakdown of the liver's blood supply:
How Blood Flows Through the Liver
1. Two blood sources enter the liver:
- The hepatic artery (brings oxygen-rich blood)
- The portal vein (brings nutrient-rich blood from the gut)
Both of these split into smaller and smaller vessels, eventually reaching tiny channels called sinusoids (where the actual exchange happens), then drain out through a series of veins → hepatic vein → back to the heart.
Think of it like a river splitting into streams, then trickling into tiny creeks, then merging back into a big river on the other side.
2. Paraumbilical veins (near your belly button) drain into the left portal vein - these are remnants of fetal circulation.
3. Some veins bypass the main drainage:
The right lobe and caudate lobe have small "shortcut" veins that drain directly into the IVC (the big vein going to the heart), skipping the hepatic veins entirely.
4. Hepatic veins also support the liver structurally - they act like scaffolding, not just drainage pipes.
5. Right lobe gets more blood than the left:
- Before birth, the umbilical vein helps supply the left side
- After birth, the umbilical vein shrivels up, and blood supply comes only from the portal vein
- The right lobe ends up getting the better share
6. The left lobe is at a disadvantage:
- Blood has to travel at an awkward angle and a longer distance to reach the tip of the left lobe
- Because of this poor blood supply, the tip of the left lobe can scar over (fibrose), forming what's called the fibrous appendix of the liver (fibrosa appendix hepatica) - this is considered a normal anatomical variant
The key takeaway: The liver has a dual blood supply that fans out into tiny vessels and back out again. The right lobe is better supplied; the left lobe tip is often a "dead end" that can turn fibrous over time.
This is a shared conversation. Sign in to Orris to start your own chat.