The Normal Liver Part 3: Lobes Flashcards
(7 cards)
Lobes of the Liver
Anatomic Divisions
4 lobes based on external landmarks as learned in Fissures & Ligaments Lectures
–____ Lobe
–____ Lobe
–____ Lobe
–____ Lobe
BUT …….
3 lobes based on vascular anatomy seen in imaging
–____
–____
–____
Right left caudate quadrate right left caudate
Right Lobe
Largest lobe; lies right of _____
Separate from left lobe by ____ lobar fissure (which passes thru GB fossa IVC)
____ superiorly to RT lobe
____ Intersegmental fissure separates RT anterior / RT posterior
RPV and ____ are intersegmentally
Anterior and posterior branches ____ are intrasegmental (centrally within segments)
midline main MHV right RHV RPV
Left lobe
Lies in epigastrum, some partially to ____ and ____ of midline
Separated from ____ lobe by main lobar fissure
____ intersegmental fissure lt. medial / lt. lateral
Ligamentum ____ - ascending branch LPV - LHV are intersegmental
____ and ____ branches of LPV are intrasegmental (centrally within segments)
right left right left teres medial lateral
Caudate Lobe
_____; posterior to medial segment ____ lobe; posterior aspect of ____
Post border = ____,
Lateral/anterior border = ligamentum ____
Anterior border = ____ (initial / horizontal)
Receives branches from RPV and ____, separate hepatic veins drain directly into IVC
____ process = anteriormedial extension (may mimic lymphadenopothy)
smallest left liver IVC venosum LPV LPV papillary
Hepatic Segments (Couinaud Classification)
Couinaud’s Classification …aka Anatomy
The ______ classification describes the functional liver anatomy which is preferred over morphological liver anatomy
Classification is based on portal segments, both functional and pathologic importance
Each segment/classification has its own blood supply (____, ____, ____), ____ and ____ drainage
Divides the liver into ____ segments
Segment I: ____
Segment II: Lateral ____ left
Segment III: Lateral ____ left
Segment IVa: Medial ____ left
Segment IVb: Medial ____ left
Segment V: Anterior ____ right
Segment VI: Posterior ____ right
Segment VII: Posterior ____ right
Segment VIII: Anterior ____ right
** Segment IV has an A and B = 9 segments
couinaud portal arterial venous lymphatics biliary 9 caudate superior inferior superior inferior inferior inferior superior superior
Hepatic Segments
(Couinaud Classification)
Segment I: ____
Segment II: Lateral ____ left
Segment III: Lateral ____ left
Segment IVa: Medial ____ left
Segment IVb: Medial ____ left
Segment V: Anterior ____ right
Segment VI: Posterior ____ right
Segment VII: Posterior ____ right
Segment VIII: Anterior ____ right
**Segment IV has an A and B = 9 segments
**Medial Segment is medial bc it is near the ____ of the liver (not ML of body)
caudate superior inferior superior inferior inferior inferior superior superior middle
Couinaud’s Anatomy and US Lobes of the Liver
The _____ hepatic vein demarcates the true right and left lobes
The ____ lobe is further divided into an anterior and posterior segment by the right hepatic vein.
The ____ lobe is divided into the medial and lateral segments by the left hepatic vein.
The fissure for the ligamentum ____ also separates the medial and lateral segments.
The medial segment is also called the ____ lobe.
The ____ lobe is a separate structure which receives blood flow from both the right- and left-sided vascular branches.
middle right left teres quadrate caudate
