Quick Jump to Sections
Location & Position
Exact Location in Abdomen
- Region: Right hypochondrium and epigastrium of abdomen
- Position: Mainly in the upper right quadrant, extending into upper left quadrant
- Vertical extent: From 5th intercostal space to right costal margin
- Protected by: Rib cage (ribs 7-11 on right side)
- Inferior extent: Does not normally extend below costal margin (if it does, indicates hepatomegaly)
Relations to Nearby Structures
Superior Relations
- Diaphragm: Separates liver from lungs and pleura
- Right pleura and lung: Related to upper part of right lobe
- Heart: Left lobe related to heart through diaphragm
- Pericardium: Anterior part of left lobe
Inferior (Visceral) Relations
- Stomach: Left lobe shows gastric impression
- Duodenum: 1st and 2nd parts create duodenal impression
- Right kidney: Posterior part shows renal impression
- Right suprarenal gland: Small suprarenal impression
- Hepatic flexure of colon: Colic impression
- Gallbladder: Fossa for gallbladder on visceral surface
Anterior Relations
- Diaphragm: Separates from anterior abdominal wall
- Right costal cartilages: 7th, 8th, 9th
- Xiphoid process: Left lobe related
Posterior Relations
- Diaphragm: Separates from vertebral column
- IVC: Groove on posterior surface
- Esophagus: Esophageal groove
- Right kidney and suprarenal: Direct contact
Peritoneal Attachments
Important: Liver is an intraperitoneal organ EXCEPT for the bare area
- Falciform Ligament: Connects liver to anterior abdominal wall and diaphragm. Contains ligamentum teres (obliterated umbilical vein). Separates right and left lobes anatomically.
- Coronary Ligament: Connects posterior surface of liver to diaphragm. Has anterior and posterior layers. Encloses the bare area (area without peritoneal covering).
- Right Triangular Ligament: Where anterior and posterior layers of coronary ligament meet on right side. Small triangular fold.
- Left Triangular Ligament: Connects left lobe to diaphragm. Longer than right triangular ligament.
Gross Anatomy of Liver
Physical Characteristics
Anterior (Diaphragmatic) Surface Features
- Surface: Smooth, convex, follows the curvature of diaphragm
- Falciform ligament: Divides anterior surface into right and left parts
- Ligamentum teres: Visible in free edge of falciform ligament
- Color: Uniform reddish-brown
- Consistency: Firm but soft (becomes hard in cirrhosis)
- Coverage: Covered by peritoneum except at attachment of falciform ligament
Visceral (Inferior) Surface Features
The visceral surface is directed downwards, backwards, and to the left. It shows multiple impressions and important structures:
H-Shaped Fissures
- Vertical right limb: Fossa for gallbladder (anteriorly) + Groove for IVC (posteriorly)
- Vertical left limb: Fissure for ligamentum teres (anteriorly) + Fissure for ligamentum venosum (posteriorly)
- Horizontal crossbar: Porta hepatis
Porta Hepatis
- Central horizontal fissure
- Gateway of liver (Latin: "gate of liver")
- Entry and exit point for major vessels
- About 5 cm long
Gallbladder Fossa
- Located on right side of H
- Houses the gallbladder
- About 7–10 cm long
- Separates quadrate lobe from right lobe
IVC Groove
- Posterior continuation of gallbladder fossa
- Deep groove for inferior vena cava
- Hepatic veins drain directly into IVC here
Liver Impressions (Important for Exams)
1. Gastric Impression
Location: Left lobe, visceral surface
Caused by: Stomach (anterior surface and lesser curvature)
2. Duodenal Impression
Location: Right lobe, near porta hepatis
Caused by: First part of duodenum
3. Colic Impression
Location: Right lobe, lower visceral surface
Caused by: Right colic flexure (hepatic flexure)
4. Renal Impression
Location: Right lobe, posterior visceral surface
Caused by: Right kidney
5. Suprarenal Impression
Location: Near IVC groove, above renal impression
Caused by: Right suprarenal gland
6. Esophageal Impression
Location: Posterior surface of left lobe
Caused by: Lower end of esophagus
Lobes of Liver
Anatomical vs Physiological Lobes
Anatomical Division (Traditional)
Based on external surface features:
- Divided by falciform ligament
- 4 lobes: Right, Left, Quadrate, Caudate
- Used in gross anatomy descriptions
Physiological/Functional Division
Based on blood supply and bile drainage:
- Divided by Cantlie's line
- 2 main functional lobes + 8 segments
- Used in surgery and radiology
- Quadrate and caudate lobes belong to LEFT functional lobe
Why this matters: During liver surgery, surgeons use functional division because each segment has its own blood supply and bile drainage. You can remove one segment without affecting others!
1. Right Lobe
Largest LobeBasic Features
- About 6 times larger than left lobe
- Occupies right hypochondrium
- Separated from left lobe by falciform ligament (anteriorly)
Important Features
- Contains gallbladder fossa on visceral surface
- Shows renal, suprarenal, duodenal, colic impressions
- Bare area located on posterior part
Right lobe is more commonly affected by liver diseases. Liver biopsy is often taken from right lobe.
2. Left Lobe
Smaller LobeBasic Features
- Smaller and thinner than right lobe
- Extends into left hypochondrium and epigastrium
- Left triangular ligament attaches here
Important Features
- Shows prominent gastric impression on visceral surface
- Related to stomach, esophagus, and heart
- Fissure for ligamentum teres on visceral surface
In functional division, quadrate and caudate lobes are part of left functional lobe.
3. Quadrate Lobe
Small, InferiorBoundaries (Very Important for Exams)
- Anteriorly: Inferior border of liver
- Posteriorly: Porta hepatis
- Right side: Fossa for gallbladder
- Left side: Fissure for ligamentum teres
Important: Anatomically looks like right lobe BUT functionally belongs to LEFT lobe — receives blood from left hepatic artery, drains bile into left hepatic duct.
Related to gallbladder. Cholecystitis can affect this lobe.
4. Caudate Lobe
Posterior, SmallBoundaries
- Anteriorly: Porta hepatis
- Posteriorly: IVC
- Right side: Groove for IVC
- Left side: Fissure for ligamentum venosum
Unique features: Independent blood supply directly from portal vein; drains directly into IVC; can hypertrophy in cirrhosis when other lobes atrophy.
In cirrhosis, caudate lobe enlarges — "caudate lobe hypertrophy" is an important radiological sign!
Quick Summary: Anatomical Lobes
| Lobe | Size | Key Features | Functional Classification |
|---|---|---|---|
| Right Lobe | Largest | Gallbladder fossa, multiple impressions | Right functional lobe |
| Left Lobe | Smaller | Gastric impression | Left functional lobe |
| Quadrate Lobe | Small | Bounded by gallbladder and lig. teres | LEFT functional lobe |
| Caudate Lobe | Small | Between IVC and lig. venosum | LEFT functional lobe |
Segmental Anatomy (Couinaud Segments)
Why Learn Liver Segments?
Surgical Planning
Remove diseased segments without affecting healthy ones.
Radiology
Tumor locations described using segment numbers in CT/MRI.
Interventional
Precise targeting for biopsies and ablations.
Clinical Communication
Universal language for doctors worldwide.
Segment I — Caudate Lobe
Location: Posterior surface of liver, between IVC and fissure for ligamentum venosum
Unique: Only segment on posterior surface; independent vascular supply; drains directly into IVC (not through hepatic veins)
Clinical: Spared in Budd-Chiari syndrome. Hypertrophies in cirrhosis.
LEFT LOBE SEGMENTS (II, III, IVa, IVb)
Segment II — Left Lateral Superior
Location: Upper part of left lateral sector
Related to heart and left dome of diaphragm. Left triangular ligament attaches here.
Supply: Left lateral portal vein + left hepatic artery branches
Segment III — Left Lateral Inferior
Location: Lower part of left lateral sector
Related to stomach (gastric impression). Forms left margin of liver.
Memory: Segments II + III together = Left lateral sector
Segment IVa — Left Medial Superior
Location: Upper part of left medial sector, superior to porta hepatis
Between falciform ligament and fissure for ligamentum venosum. Related to heart through diaphragm.
Segment IVb — Left Medial Inferior (Quadrate Lobe)
Location: Lower part of left medial sector = anatomical Quadrate lobe
Between gallbladder fossa (right) and ligamentum teres (left), anterior to porta hepatis.
Relations: Related to gallbladder and pylorus of stomach
RIGHT LOBE SEGMENTS (V, VI, VII, VIII)
Segment V — Right Anterior Inferior
Location: Lower part of right anterior sector, right side of gallbladder
Related to gallbladder, hepatic flexure of colon, right kidney.
Clinical: Common site for liver tumors; adjacent to gallbladder
Segment VI — Right Posterior Inferior
Location: Lower part of right posterior sector
Related to right kidney (renal impression) and hepatic flexure of colon.
Memory: "Six sits on kidney"
Segment VII — Right Posterior Superior
Location: Upper part of right posterior sector
Related to right dome of diaphragm and bare area of liver.
Clinical: Difficult to access surgically due to posterior position
Segment VIII — Right Anterior Superior
Location: Upper part of right anterior sector, forms upper anterior surface
Related to right dome of diaphragm and right lung.
Memory: "Eight is great" — largest of right anterior segments
Segments Summary Table
| Segment | Name | Location | Memory Trick |
|---|---|---|---|
| I | Caudate | Posterior | "I am behind everyone" |
| II | Left lateral superior | Upper left lateral | "Two is on top left" |
| III | Left lateral inferior | Lower left lateral | "Three is below two" |
| IVa | Left medial superior | Upper left medial | "Four-A is above porta" |
| IVb | Left medial inferior (Quadrate) | Lower left medial | "Four-B is below = quadrate" |
| V | Right anterior inferior | Lower right anterior | "Five is near gallbladder" |
| VI | Right posterior inferior | Lower right posterior | "Six sits on kidney" |
| VII | Right posterior superior | Upper right posterior | "Seven is in heaven (high)" |
| VIII | Right anterior superior | Upper right anterior | "Eight is great (large)" |
Memory Techniques for Segments
Trick 1: Portal Triad per Segment
Each segment gets its own: Portal Vein branch + Hepatic Artery branch + Bile Duct (trifecta = independent unit).
Trick 2: Clock-face Method
- Segment I is behind (cannot see)
- Left side (9–12 o'clock): II, III, IV
- Right anterior: VIII (top), V (bottom)
- Right posterior: VII (top), VI (bottom)
Trick 3: Left-to-Right Counting
- II–III (left lateral) → IV (left medial)
- V–VIII (right lobe, counterclockwise)
- I is special (posterior only)
Liver Surfaces & Borders
1. Diaphragmatic Surface
Description
- Smooth, convex (dome-shaped)
- Directed upward, forward, and to the right
- Completely covered by peritoneum (except falciform ligament attachment)
Clinical
- Liver dullness on percussion: 5th ICS to costal margin
- Reduced dullness = pneumoperitoneum
- Can be injured in lower chest trauma
- Subphrenic abscess can form here
2. Visceral (Inferior) Surface
H-Shaped Fissures (Key Feature)
Right Vertical Limb
- Anterior: Fossa for gallbladder
- Posterior: Groove for IVC
Left Vertical Limb
- Anterior: Fissure for ligamentum teres
- Posterior: Fissure for ligamentum venosum
Horizontal Crossbar
- Porta hepatis — about 5 cm long
- Entry/exit for vessels, ducts, nerves
Areas NOT Covered by Peritoneum
- Porta hepatis
- Fossa for gallbladder
- Groove for IVC
- Bare area
3. Posterior Surface & Bare Area
Bare Area Boundaries
- Anterior: Anterior layer of coronary ligament
- Posterior: Posterior layer of coronary ligament
- Right: Right triangular ligament
- Left: IVC and caudate lobe
Clinical Importance
- Only area without peritoneal covering
- Direct pathway for spread of infections to/from diaphragm
- Site where hepatic veins leave liver to enter IVC
- Right kidney and suprarenal gland in direct contact
Inferior Border
Characteristics
- Sharp, thin, well-defined edge
- Oblique direction: 9th right to 8th left costal cartilage
- Normal position: Does NOT extend below costal margin
Clinical Significance
Hepatomegaly: Inferior border extends BELOW costal margin. Measured in finger breadths. Sharp edge becomes rounded in cirrhosis.
Superior Border
Characteristics
- Poorly defined, thick, rounded
- Cannot be palpated (unlike inferior border)
- Right: 5th intercostal space in mid-clavicular line
- Left: 5th rib in mid-clavicular line
Normal liver span: 10–12 cm in mid-clavicular line. Reduced span suggests cirrhosis or atrophy.
Liver Ligaments
Understanding Liver Ligaments
Important Concept: Liver "ligaments" are NOT true ligaments. They are double-layered folds of peritoneum connecting liver to: diaphragm, anterior abdominal wall, or stomach (lesser omentum). Liver is mainly supported by intra-abdominal pressure and surrounding organs.
1. Falciform Ligament
Most ProminentDescription
- Sickle-shaped double peritoneum (Latin "falx" = sickle)
- Sagittal position (vertical, anterior-posterior)
- Separates right and left anatomical lobes
Contents (Free Lower Border)
- Ligamentum teres hepatis — obliterated left umbilical vein
- Paraumbilical veins — connect portal to systemic system
Clinical Importance
- Portal hypertension: Paraumbilical veins dilate → Caput medusae
- Important surgical landmark
2. Ligamentum Teres
Fetal RemnantNature
- Obliterated left umbilical vein from fetal life
- Runs in FREE LOWER EDGE of falciform ligament
- From umbilicus to left portal vein (~15–20 cm)
Fetal Function
- In fetus = Left umbilical vein
- Carried oxygenated blood from placenta to fetus
- After birth: obliterates → becomes ligamentum teres
Clinical
- Portal hypertension → paraumbilical veins reopen → Caput medusae
Memory: "Round ligament = Remnant of umbilical vein" (R-R-U)
3. Coronary Ligaments
Enclose Bare AreaTwo Layers
Anterior Layer (Upper)
- Reflected from diaphragmatic surface
- Forms upper boundary of bare area
- Continuous with falciform ligament
Posterior Layer (Lower)
- Reflected from posterior surface
- Forms lower boundary of bare area
- Continues as lesser omentum
Clinical
- Subphrenic abscess can develop here
- Hepatic veins pass through bare area to IVC
- Important during hepatectomy
4 & 5. Triangular Ligaments
Lateral Ends| Feature | Left | Right |
|---|---|---|
| Length | Longer | Shorter (small) |
| Lobe attached | Left lobe | Right lobe |
| Formation | Coronary layers meet (left side) | Coronary layers meet (right side) |
| Surgical use | Divided in left hepatectomy | Divided in right hepatectomy |
Memory: "Left is Longer, Right is Runt"
6. Lesser Omentum
Portal Triad InsideTwo Parts
Hepatogastric Ligament
- Liver → lesser curvature of stomach
- Broad, thin membrane
- Contains: right/left gastric vessels, lymph nodes, vagal branches
Hepatoduodenal Ligament
- Porta hepatis → 1st part of duodenum
- Thick, free right border
- Contains Portal Triad (DAV)
Portal Triad — "DAV" (Right to Left):
- Duct (CBD) — rightmost
- Artery (Hepatic artery proper) — middle left
- Vein (Portal vein) — posterior, largest
Pringle Maneuver: Clamp hepatoduodenal ligament to stop liver bleeding in emergency surgery (controls portal vein + hepatic artery). Safe for 20–30 min.
Ligaments Quick Summary
| Ligament | Connects | Key Feature | Clinical Point |
|---|---|---|---|
| Falciform | Liver → Ant. abd. wall & diaphragm | Contains ligamentum teres in free edge | Caput medusae in portal hypertension |
| Lig. Teres | Umbilicus → Left portal vein | Obliterated umbilical vein | Reopens in portal hypertension |
| Coronary | Liver → Diaphragm (posterior) | Encloses bare area | Hepatic veins pass through |
| Right Triangular | Right lobe → Diaphragm | Small, short | Divided in right hepatectomy |
| Left Triangular | Left lobe → Diaphragm | Longer than right | Divided in left hepatectomy |
| Lesser Omentum | Liver → Stomach & duodenum | Portal triad in free edge | Pringle maneuver |
Blood Supply of Liver
Dual Blood Supply — Key Concept
Portal Vein (70–75%)
- Nutrient-rich blood from GI tract and spleen
- Less oxygenated
- Formed by SMV + splenic vein (behind neck of pancreas)
- Enters liver at porta hepatis
- Divides into right and left branches
Hepatic Artery (25–30%)
- Oxygenated blood from aorta
- Celiac trunk → Common hepatic artery → Proper hepatic artery
- Divides into right and left hepatic arteries
- Right hepatic artery crosses behind CBD (important surgical point)
- Cystic artery arises from right hepatic artery
Venous Drainage
- Hepatic veins: 3 main veins (right, middle, left) drain into IVC
- Right hepatic vein: Drains segments V, VI, VII, VIII
- Middle hepatic vein: Drains segments IV, V, VIII (often joins left)
- Left hepatic vein: Drains segments II, III, IV
- Caudate lobe: Direct drainage into IVC via separate small veins
- IVC: Receives hepatic veins just below diaphragm (at T8 level)
Portal Hypertension — Portosystemic Anastomoses
When portal pressure increases (cirrhosis), blood bypasses liver via porto-systemic connections:
- Esophageal varices: Left gastric vein → esophageal veins → azygos (risk of rupture = life-threatening bleed)
- Caput medusae: Paraumbilical veins → superficial abdominal veins around umbilicus
- Hemorrhoids: Superior rectal vein → middle/inferior rectal veins
- Retroperitoneal anastomoses: Portal branches → retroperitoneal veins
Clinical Anatomy
Hepatomegaly
Enlarged liver palpable below costal margin. Causes: hepatitis, cirrhosis, malignancy, heart failure, metabolic disorders.
Jaundice
Yellow discoloration due to bilirubin accumulation. Pre-hepatic (hemolysis), hepatic (hepatitis/cirrhosis), or post-hepatic (bile duct obstruction).
Cirrhosis
Fibrosis replaces normal liver tissue. Causes: alcohol, hepatitis B/C, NAFLD. Leads to portal hypertension.
Liver Biopsy
Usually from right lobe via intercostal approach. Patient holds breath to avoid pneumothorax. Risk: bleeding from hepatic vessels.
Budd-Chiari Syndrome
Hepatic vein thrombosis. Caudate lobe (Segment I) is SPARED as it drains directly into IVC. Characteristic caudate lobe hypertrophy.
Liver Trauma
Right lobe more commonly injured (larger, less protected). Bare area allows retroperitoneal hematoma formation. IVC injury = massive hemorrhage.
Subphrenic Abscess
Pus between liver and diaphragm. Via bare area or after abdominal surgery. Right subphrenic most common. Requires drainage.
Liver Transplantation
Anastomose: IVC, portal vein, hepatic artery, bile duct. Living donor: segments II-III (left lateral) for pediatric; right lobe for adult recipients.
NEET / Exam High-Yield Points
Must-Know Facts for NEET
Lobes & Functional Division
- Quadrate lobe = functionally LEFT (not right)
- Caudate lobe = functionally LEFT (not right)
- Cantlie's line divides functional lobes
- Falciform ligament divides anatomical lobes
Ligamentum Teres & Venosum
- Lig. teres = obliterated LEFT umbilical vein
- Lig. venosum = obliterated ductus venosus
- Both are fetal remnants
- Lig. teres is in free edge of falciform lig.
Portal Triad — DAV Rule
- Duct (CBD) = right side
- Artery (hepatic) = left side
- Vein (portal) = posterior
- Pringle maneuver = clamp free right edge of lesser omentum
Caudate Lobe Special Points
- Spared in Budd-Chiari syndrome
- Hypertrophies in cirrhosis
- Independent blood supply from portal vein
- Drains DIRECTLY into IVC
Porta Hepatis Contents
- Right portal vein (larger) + Left portal vein
- Hepatic artery (right + left branches)
- Right + Left hepatic ducts
- Lymph nodes and lymphatics
Blood Supply Numbers
- Portal vein = 70–75% of blood supply
- Hepatic artery = 25–30% of blood supply
- But artery provides ~50% of oxygen
- Dual blood supply = unique to liver
Common NEET Questions
| Question | Answer |
|---|---|
| Largest lobe of liver | Right lobe |
| Quadrate lobe belongs to which functional lobe? | LEFT functional lobe |
| Caudate lobe is spared in which condition? | Budd-Chiari syndrome |
| What is ligamentum teres? | Obliterated left umbilical vein |
| What is ligamentum venosum? | Obliterated ductus venosus |
| Contents of free edge of lesser omentum (DAV)? | Duct (CBD), Artery (hepatic), Vein (portal) |
| Number of functional segments of liver | 8 (Couinaud classification) |
| What is Pringle maneuver? | Clamping hepatoduodenal ligament to stop liver bleeding |
| Where do hepatic veins drain? | Into IVC just below diaphragm |
| Bare area of liver — what is unique? | No peritoneal covering; directly attached to diaphragm |
| Caput medusae occurs due to? | Paraumbilical vein dilatation in portal hypertension |
| Which ligament separates anatomical lobes? | Falciform ligament |