Liver Lab (alisa)

Alisa

liver has \____ veins

3
-main hepatic
-right hepatic
-left hepatic

right & left liver lobes are divided into \____ segments

2 segments each (4 segments total)

right lobe is divided into what segments

anterior & posterior

left lobe is divided into what segments

medial & lateral

what separates the liver into different segments/lobes?

the 3 liver veins

which vein separates the liver into medial & lateral left lobes\>

left hepatic vein

which vein separates the liver into anterior & posterior right lobes?

right hepatic vein

which vein completely separates the liver into right & left lobes?

middle hepatic vein
-also separates right anterior segment from left medial segment

which vein separates the right anterior segment & left medial segment

middle hepatic vein

what does the left hepatic vein separate?

medial & lateral left lobe

what does the right hepatic vein separate?

anterior & posterior right lobe

what does the middle hepatic vein separate?

-right & left lobes
-right anterior segment & left medial segment

what separates the caudate lobe from the medial left lobe/segment?

ligamentum venosum

ligamentum venosum is a remnant of

ductus venosus
-ductus venosus is open vessel in fetus that shunts blood from umbilical & closes off when born to become ligamentum venosum

main lobar fissure is between

between the gallbladder & the junction of the right & left portal veins

ligamentum teres is a remnant of

the fetal umbilical vein

ligamentum teres appears as

a triangle shape in the left lobe
-hyperechoic

portahepatis is aka

portal triad
(usually referred to as portahepatis)
-is like the hilum of liver containing 3 things

portahepatis contains

3 things
-main portal vein
-common hepatic duct
-proper hepatic artery

portal system is not a part of

aorta, IVC, or venous system
it is a system itself

portal vein provides \____% of total blood flow to liver

75%

portal vein gives \___% of oxygen rich blood to liver

60%

blood from portal vein is very nutrient rich (T/F)

true
very nutrient rich bc lot of that blood is coming from bowel

portal system is made up of

-splenic vein
-IMV (inferior mesenteric vein)
-SMV (superior mesenteric vein)
-main portal vein ??

splenic vein drains from \________ towards \__________

drains from spleen towards pancreas
follows underneath border of spleen

IMV & SMV come from ...

bowel bringing back blood w/ oxygen & nutrients

IMV attaches into \___________

splenic vein
(don't usually see bc so small)

SMV comes up & meets \____________

splenic vein at portal splenic confluence

what makes the main portal vein?

SMV & splenic vein
(portal splenic confluence)

what brings the other 40% of oxygenated blood to liver?

hepatic artery at portahepatis
(60% is from portal vein)

hepatomegaly

enlarged liver
if greater than 15 cm

what is the first branch off the abdominal aorta?

celiac axis/trunk

what is the second branch off the abdominal aorta?

SMA

what branches off the abdominal aorta after SMA?

left & right renal arteries

IMA & SMA vs IMV & SMV

IMA & SMA: part of aorta

IMV & SMV: part of portal system
-most veins drain back into IVC but IMV & SMV drain into & make up the portal system

what comes off the aorta & branches off almost immediately?

celiac axis
-can see seagull wings when in trans

what comes off aorta & turns to run parallel w/ the aorta?

SMA

parts of celiac axis

-hepatic artery
-splenic artery
-left gastric artery (is super small & can't see it)

seagull wings of celiac axis

left side is splenic artery, goes toward spleen
right side is hepatic artery, goes towards liver