Download Mesentery

In the name of Allah


-
-
Abdominal cavity
Peritoneal cavity
Greater sac
Lesser sac
Peritoneum






Peri (around)+ teinein (to stretch)
Largest serous membrane:
Forms peritoneal cavity which closed in male.
Separated from fascia transversalis by
extraperitoneal fat.
Consists of a single layer of flat mesothelial cells
which supported by loose connective tissue.
Mesothelial cells may transform into fibroblast
after surgery and inflammation.
Peritoneum

Parietal
Visceral
The peritoneum which suspends viscera called:
Mesentery (meso-)
Omentum (epiploon)
Peritoneal lig.
Meso- and lig. provide pathways for vessels, nerve and
lymphatics
Intraperitoneal

Retroperotoneal



-
Peritonium
Dorsal mesentery
- Dorsal mesogastrium
- Dorsal mesoduodenum
- Mesentery proper
(dorsal mesentery of
jejunum & ileum)
- Dorsal mesocolon
 Ventral mesentery
- Lesser omentum
- Falciform lig

Peritonium
Peritoneal folds
derived from ventral
mesentery
 Falciform lig.
- Ligamentum teres
 Coronary lig.
 Triangular ligs.
peritonium
Peritoneal folds
derived from ventral
mesentery
 Lesser omentum
- Hepatogastric
- Hepatoduodenal
- Free border (right
lateral)
peritonium
Peritoneal fold
derived from dorsal
mesentery
 Dorsal mesogastrium
- Greater omentum
- Gastrocolic
- Gastrosplenic lig.
- Splenorenal
peritonium
Peritoneal fold
derived from dorsal
mesentery
 Transverse mesocolon
Passing on;
- 2nd part of duodenum
- pancreas,
- Lt. kidney
- to the left colic (splenic)
flexure
- Phrenicocolic lig
peritonium
Peritoneal fold
derived from dorsal
mesentery
 Mesentery proper
- From left side of L2
- To Rt. Sacroiliac joint
- Crosses 3rt part of
duodenum, aorta, IVC, Rt
ureter, Rt. psoas
peritonium
Peritoneal fold
derived from dorsal
mesentery
 Mesentery proper
- root 15 cm
- intestinal border …?
- Depth 20cm
peritonium
Peritoneal fold
derived from dorsal
mesentery
 mesoappendix
peritonium
Peritoneal fold
derived from dorsal
mesentery
 Sigmoid mesocolon
- V shape
- Left arm over psoas &
Rt. At the level of S3
peritonium
Peritoneum of the lower
anterior abdominal wall
- Raised into five ridges
1- Median umblical fold
(urachus)
2,3- Medial umblical folds
(umblical artereis)
4,5- Lateral umblical folds
(inferior epigastric
arteries)

peritonium
Peritoneum of the lower
anterior abdominal wall
- Forms 3 fossae on each
side:
1- supravesical
2- medial inguinal
3- lateral inguinal
Direct and indirect
hernia?

peritonium

Peritoneum of the pelvis
peritonium



Peritoneum of the
pelvis:
♂ rectovesical pouch
♀ recto-uterine and
vesico-uterine
Peritoneal
cavity

-
-
-
-
Supramesocolic
compartment
Right subphrenic
Right subhepatic
(hepatorenal)
Lesser sac
Left subphrenic
Left subhepatic
Peritoneal
cavity
Lesser sac
 In front
- lesser omentum
- Stomach
 Behind
- Post. Abdo. Wall
- Pancreas
Peritoneal
cavity


-
Lesser sac
Left
Spleen
Gastrosplenic lig.
Splenorenal lig.
Right
Epiploic foramen
Peritoneal
cavity
Lesser sac
 Above
- Diaphragm
 Below
- Greater omentum
- Gastrocolic lig.
-
Peritoneal
cavity
Eppiloic Foramen
- Post.; I.V.C
- Ant.;
Lesser omentum
Hepatic art.
Bile duct
Portal vien
Peritoneal
cavity
Eppiloic Foramen
Superior:
caudate process
Inferior:
first part of
duodenum
Peritoneal
cavity
inframesocolic
compartment
1-right infracolic
space
2-left infracolic space
3-paracolic gutter

Peritoneal
cavity
Duodenal recesses
- Sup. Duodenal
- Inf. Duodenal
- Paraduodenal
- Retroduodenal
Peritoneal
cavity
Cecal recesses
- Sup. Ileocecal
- Inf. Ileocecal
- Retrocecal and
retrocolic
Peritoneal
cavity
Intersigmoid recess
Retroperitoneal spaces ?
Blood supply?
 Innervation?

Peritonium
functions









Facilitates movement of viscera to glide easily on one another
Concerned with secretion and absorption (peritoneal dialysis)
Localizes infection
Plays an important role in suspending the various organs
Serves as a means of conveying blood and lymph vessels and
nerves
Stores large amounts of fat
Promotes healing
Promotes healing and even regeneration of nervous system
Angiogenesis
In the name of Allah
Peritoneum
development

-
Bilaminar germ disc
Epiblast
Hypoblast
Peritoneum
development

-
Trilaminar germ disc
Ectoderm
Mesoderm
Endoderm
Peritoneum
development

-
Mesoderm
Paraxial
Intermediat
lateral plate
Peritoneum
development

-
lateral plate
Somatic or Parietal
Splanchnic or visceral
mesoderm
Peritoneum development
Peritoneum
development
Dorsal mesentery
- Dorsal
mesogastreum
- Dorsal
mesoduodenum
- Mesentery proper
(dorsal mesentery of
jejunum & ileum)
- Dorsal mesocolon

Peritoneum
development

-
•
•
Ventral mesentery
Derived from
septum
transversum
Divided into
Lesser omentum
Falciform lig
Peritoneum
development
Peritoneum development
Peritoneum development

9
Peritoneum development

10
Peritoneum development

11
Peritoneum development

12
Peritoneum development

16