Liver Flashcards
Which two region is the liver located in?
- Right hypochondriac region
2. Epigastric region
Every substance absorbed by the alimentary tract is first received by the liver, except for what?
Lipids
The liver stores ______
The liver secretes ______
Stores glycogen
Secretes bile
Name the 2 surfaces of the liver
Diaphragmatic surface
Visceral surface
Which surface of the liver is anterosuperior?
Diaphragmatic surface
Which surface of the liver is posteroinferior?
Visceral surface
Which area of the liver is not covered with visceral peritoneum and is known as a ‘bare area’ due to it being in contact with the diaphragm?
Posterior aspect
Smooth and convex surface of the liver is known as…
Diaphragmatic surface
Irregular and flat surface of the liver is known as…
Visceral surface
Visceral surface is covered with peritoneum expect what 2 structures?
- Porta hepatis
2. Fossa of gallbladder
How many lobes does the liver have?
4 lobes
Name the 4 lobes of the liver?
Right
Left
Caudate
Quadrate
Which lobe is anterior, caudate or quadrate?
Caudate
Caudate and quadrate are only seen on what surface?
Visceral surface
What structure(s) separates the right and left lobe?
Falciform ligament (anteriorly) Left sagittal fissure (posteriorly)
What separates the caudate and quadrate lobes from the right lobe?
Right sagittal fissure
What separates the caudate and quadrate lobe?
Porta hepatis
Right and left sagittal fissures
How many functional lobes are there?
2
Name the 2 functional lobes of the liver
Right lobe
Left lobe
Caudate and quadrate are part of which lobe?
Right lobe
Transverse fissure dividing the caudate and quadrate lobes?
Porta hepatis
The diaphragmatic surface is in direct contact with what organ as a result of being ‘bare’?
Diaphragm
What 5 structures enter the porta hepatis?
Portal vein Hepatic artery Hepatic nerve plexus Hepatic ducts Lymphatic vessels
What encloses the portal triad?
Lesser omentum
Name the 3 structures which make up the portal triad?
Portal vein
Hepatic artery
Bile duct
Thickened free edge of the lesser omentum which extends between the porta hepatis and the duodenum
Hepatoduodenal ligament
Encloses the structures that pass through the porta hepatis
Hepatoduodenal ligament
Passes from the liver to the lesser curvature of the stomach and the first 2cm of the duodenum
Lesser omentum
What 2 things mean that there is 2 functional lobes (portal lobes)
- Blood supply
2. Glandular secretion
Connects the liver to the lesser curvature of the stomach
Hepatogastric ligament
Connects the liver to the superior part of thre duodenum
Hepatoduodenal ligament
Attaches the anterior liver surface to anterior abdominal wall
Falciform ligament
What ligament is the remnant of the umbilical vein?
Round ligament of the liver
Another term for the round ligament of the liver
Ligamentum teres
Where is the round ligament of the liver located?
Exists in the free edge of the falciform ligament
Ligaments which attach the superior surface of liver to inferior surface of diaphragm
Coronary ligaments
Function of umbilical vein
Carried well-oxygenated blood from the placenta to the fetus
What is the fibrous remnant of the fetal ductus venosus?
Ligamentum venosum
Function of ligamentum venosum
Shunted blood from umbilical vein to the IVC, short-circuiting the liver
Blood supply of liver
Hepatic artery
Hepatic portal vein
Venous drainage of liver
Hepatic veins
Ligaments formed by the anterior and posterior folds of the coronary ligament
Triangular ligaments (left and right)
Coronary ligament has 2 folds called what?
Anterior and Posterior folds
Function of triangular ligaments
Attach each lobe of the liver to diaphragm
Which percentage of blood does the hepatic artery proper supply to the liver?
25%
Which percentage of blood does the hepatic portal vein supply to the liver?
75%
Supplies oxygenated blood
Hepatic artery proper
Supplies partially deoxygenated nutrient rich blood from GI tract
Hepatic portal vein
Drainage of the hepatic veins?
Into IVC
Where does the hepatic artery proper originate from?
Coeliac trunk
Blood from which 2 vessels mixes in the sinusoids?
Hepatic artery proper
Hepatic portal vein
Which vessels supply the hepatocytes>
Hepatic artery proper
Hepatic portal vein
Deoxygenated blood leaves via which vessel?
Central venule
What produces bile?
Hepatocytes
Transports bile from the liver to the gallbladder
Bile duct
How many hepatic segments are the portal lobes of the liver divided into?
8
Hepatic artery is a branch of which artery?
Coeliac trunk
The right and left lobes of the liver are supplied by which branches?
Right and left branches of hepatic artery and right and left branches of hepatic portal vein)
Name the 2 venous systems of the liver
Portal system
Systemic system
Transports partially deoxygenated blood to the liver for
processing
Portal system (portal vein drains into the liver)
Returns blood to the right atrum
Systemic system (Hepatic veins drain into IVC. IVC drains into right atrium of heart)
Communication between the portal and systemic venous systems
Porto-systemic anastomosis
Name the 4 sites of porto-systemic anastomosis
- Oseophageal
- Rectal
- Retroperitoneal
- Paraumbilical
if blood flow in the portal system is obstructed
Portal hypertension
Varices
Due to blood being redirected via porto-systemic anastomoses. Veins around anastomosis become dilated as there is increased blood flow
When is portal hypertension diagnosed?
Portal venous pressure is higher than 20mmHg
Where does the nerve supply of the liver derive from?
Hepatic nerve plexus
Hepatic nerve plexus is a derivate of what?
Celiac plexus
Hepatic nerve plexus has sympathetic fibres which derive from where?
Celiac plexus
Hepatic nerve plexus has parasympathetic fires which derive from where?
Anterior and posterior vagal trunks
Subperitoneal fibrous capsule of the liver
Glisson capsule
Innervation of Glisson capsule
Lower intercostal nerves
Lymphatic drainage of anterior aspect of liver
Hepatic lymph noes–> Colic lymph nodes–> Cisterna chyli
Lymphatic drainage of posterior aspect of liver
Phrenic + posterior mediastinal LN –> right lymphatic + thoracic ducts
Where are the hepatic lymph nodes located?
Around the hepatic vessels