Gastrointestinal – Anatomy #5 (liver)

Location of liver?
Location of liver?
in upper part of abdominal cavity just beneath diaphragm

lobes of liver?
lobes of liver?
large right lobe + small left lobe –> falciform ligament in between (anterior)

right lobe is divided into?
right lobe is divided into?
(posterior) quadrate + caudate lobes –> due to presence of gallbladder, fissure for ligamentum teres, IVC, fissure for ligamentum venosum

porta hepatis (hilum of liver) ?
porta hepatis (hilum of liver) ?
• on posterior, between caudate and quadrate lobes

• attached to upper part of lesser omentum

• inside of it –> right and left hepatic ducts + portal vein + sympathetic and parasympathetic nerve fibres + few hepatic LNs (drain into celiac LNs)

capsule of liver?
100% surrounded by fibrous capsule (only 1/2 covered with peritoneum)

liver is made of ?
liver is made of ?
liver lobules

*central vein of each lobule –> a tributary of hepatic vein

portal canals (spaces between lobules) ?
portal canals (spaces between lobules) ?
contain triad –> branches of hepatic artery, portal vein and tributary of bile duct

arterial and venous blood of liver?
arterial and venous blood of liver?
pass between liver cells via “sinusoids” –> drain into central vein

*blood won’t get mixed with bile!

anterior relations of liver?
anterior relations of liver?
• diaphragm
• right and left costal margins
• right and left pleura
• lower margin of both lungs
• xiphoid process
• anterior abdominal wall in subcostal angle

posterior relations of liver?
• diaphragm
• right kidney
• hepatic flexure of colon
• duodenum
• gallbladder
• IVC
• esophagus
• stomach fundus

blood supply of liver?
blood supply of liver?
• hepatic artery (branch of celiac artery) –> divided into right + left terminal branches –> enter porta hepatis
• portal vein –> divided into right + left terminal branches –> enter porta hepatis (behind hepatic artery)
• hepatic veins (3/+) –> emerge from posterior surface of liver –> drain into IVC

lymph drainage for liver?
• lymph vessels leave liver –> enter several LNs in porta hepatis –> efferent vessels pass to celiac LNs

• few vessels from the bare area of liver –> go through diaphragm –> to posterior mediastinal LNs

Nerve supply for liver?
• sympathetic + parasympathetic –> from celiac plexus
• anterior vagal trunk –> gives rise to large hepatic branches (pass directly to liver)

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What 3 structures make up the portal triad? Hepatic artery, bile duct, portal vein What two ligaments is the lesser omentum comprised of? Its part of the lesser omentum so does it attach to greater or lesser curvature? hepato-duodenal & …

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