Download MBBS Portal Vein Lecture PPT

PORTAL VEIN

--- Content provided by FirstRanker.com ---

PORTAL VEIN

--- Content provided by FirstRanker.com ---

Hepatic Portal Vein

? Origin & end in capillaries /

venous

--- Content provided by FirstRanker.com ---

sinusoids

? Size: 8cm X 1 cm

--- Content provided by FirstRanker.com ---

? Drains

? Abdominal part of alimentary

tract (except lower part of anal

--- Content provided by FirstRanker.com ---

canal)

? Spleen & Pancreas

--- Content provided by FirstRanker.com ---

? Conveys absorbed products of

digested food to liver

? Devoid of valves

--- Content provided by FirstRanker.com ---

? Reservoir of blood : 1200 ml /

min

--- Content provided by FirstRanker.com ---

Formation

? Union of Sup mesenteric & Splenic vein

--- Content provided by FirstRanker.com ---

? Between neck of Pancreas & IVC at level L2



Course: Extrahepatic part

--- Content provided by FirstRanker.com ---

Passes upwards & Rt,

behind neck of pancreas &

--- Content provided by FirstRanker.com ---

1st part of duodenum

? Enters rt free margin of

lesser omentum in front of

--- Content provided by FirstRanker.com ---

epiploic foramen with Bile

Dut & Hepatic artery.

--- Content provided by FirstRanker.com ---

? Reaches porta hepatis &

divides into rt & Lt

branches.

--- Content provided by FirstRanker.com ---

Course: Intrahepatic part

? Branches of

--- Content provided by FirstRanker.com ---

portal vein

? Segmental brs

--- Content provided by FirstRanker.com ---

? Brs in Portal

canal

? Hepatic

--- Content provided by FirstRanker.com ---

sinusoids

? Central veins

--- Content provided by FirstRanker.com ---

? Sublobular veins

? Hepatic veins

IVC

--- Content provided by FirstRanker.com ---

TRIBUTARIES

Rt Branch

--- Content provided by FirstRanker.com ---

-Shorter, wider

- Receives cystic

--- Content provided by FirstRanker.com ---

vein

Lt branch

-Narrower, longer

--- Content provided by FirstRanker.com ---

- Runs in Porta

hepatis

--- Content provided by FirstRanker.com ---

from Rt to Lt

- Brs to Caudate &

Quadrate

--- Content provided by FirstRanker.com ---

lobe

-Receives

--- Content provided by FirstRanker.com ---

Paraumbilical

veins

--- Content provided by FirstRanker.com ---

TRIBUTARIES

? Formative

? Sup Mesenteric vein

--- Content provided by FirstRanker.com ---

? Splenic vein

? Received by Trunk

--- Content provided by FirstRanker.com ---

? Rt & lt Gastric veins

? Superior PD vein

? Received by branches

--- Content provided by FirstRanker.com ---

? Cystic vein

? Paraumbilical veins

--- Content provided by FirstRanker.com ---

? Occasional

? Inf mesenteric vein

? Rt gastroepiploic vein

--- Content provided by FirstRanker.com ---

? Pre-pyloric vein.


PARTS

--- Content provided by FirstRanker.com ---

Parts

? Infraduodenal

--- Content provided by FirstRanker.com ---

? Retroduodenal

? Supraduodenal

--- Content provided by FirstRanker.com ---

RELATIONS

? Infra duodenal

? Ant: Neck of

--- Content provided by FirstRanker.com ---

Pancreas

? Post: IVC

--- Content provided by FirstRanker.com ---

? Retro duodenal

? Ant: Duodenum

(1st Part), Bile duct,

--- Content provided by FirstRanker.com ---

GD artery

? Post: IVC

--- Content provided by FirstRanker.com ---

? Supra duodenal : In

rt free margin of

lesser omentum

--- Content provided by FirstRanker.com ---

? Ant : hepatic artery

& bile duct

--- Content provided by FirstRanker.com ---

? Post: IVC
PORTO-CAVAL ANASTOMOSIS

--- Content provided by FirstRanker.com ---

Liver like lungs has dual blood

supply. The hepatic portal vein

--- Content provided by FirstRanker.com ---

brings 75-80% blood to liver.

Portal vein contains 40% oxygen

than blood returning to the heart

--- Content provided by FirstRanker.com ---

from systemic circuit.

The hepatic portal vein contains

--- Content provided by FirstRanker.com ---

virtually all nutrients absorbed

from the alimentary tract to the

liver with the exception of lipids

--- Content provided by FirstRanker.com ---

which is absorbed through the

hepatic artery.

--- Content provided by FirstRanker.com ---

--- Content provided by FirstRanker.com ---

--- Content provided by FirstRanker.com ---

--- Content provided by FirstRanker.com ---

--- Content provided by FirstRanker.com ---

PORTAL HYPERTENSION

? > 12 mm of Hg

? Causes :

--- Content provided by FirstRanker.com ---

? Pre hepatic : Thrombosis of portal

vein

--- Content provided by FirstRanker.com ---

? Hepatic: Cirrhosis

? Post hepatic: Budd-Chiari Syndrome

? Effects: Splenomegaly, Ascites,

--- Content provided by FirstRanker.com ---

Collateral circulation through sites of

Portasystemic anastomosis

--- Content provided by FirstRanker.com ---

--- Content provided by FirstRanker.com ---

EXPOSURE OF KIDNEY FROM

BEHIND

--- Content provided by FirstRanker.com ---

Loin: It is the region on the back of the trunk, bounded

above by the 12th rib, below by the iliac crest, medially

--- Content provided by FirstRanker.com ---

by the posterior median line, and laterally by flank.
SURFACE MARKING OF KIDNEY FROM BACK

It is done within parallelogram of Morris which is drawn in

--- Content provided by FirstRanker.com ---

the following way:

1. First two horizontal lines are drawn one at the level of

spine of T11 and other at the level of spine of L3.

--- Content provided by FirstRanker.com ---

2. Then two vertical lines are drawn, one 2.5 cm away and

other 9 cm away from the posteromedian plane.

--- Content provided by FirstRanker.com ---

3. The centre of hilum of the each kidney lies approximately

at the lower border of L1.

--- Content provided by FirstRanker.com ---

Layers to be reflected to reach the Kidney

1. Skin.

--- Content provided by FirstRanker.com ---

2. Superficial fascia.

3. Posterior layer of the

--- Content provided by FirstRanker.com ---

thoraco-lumbar fascia

with

attached latissimus dorsi

--- Content provided by FirstRanker.com ---

and serratus posterior

inferior muscles.

--- Content provided by FirstRanker.com ---

4. Erector spinae

(sacrospinalis) muscles.
5. Middle layer of the

--- Content provided by FirstRanker.com ---

thoraco-lumbar fascia.

6. Quadratus lumborum

muscle.

--- Content provided by FirstRanker.com ---

7. Anterior layer of the

thoraco-lumbar fascia.