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What is Mesentery?
Clinicals
What is Peritoneum?
Functional Importance of
Mesentery
Formation of Mesentery
Histological Appearance of Mesentery
THE MESENTERY IS THE FAN-
SHAPED DOUBLE LAYER OF
PERITONEUM THAT SUSPENDS
THE JEJUNUM AND ILEUM FROM
THE POSTERIOR WALL OF THE
ABDOMEN
THE PERITONEUM IS THIN SEROUS MEMBRANE
THAT LINES THE ABDOMINAL AND PELVIC
CAVITIES, AND COVERS MOST ABDOMINAL
VISCERA. IT IS COMPOSED OF LAYER OF
MESOTHELIUM SUPPORTED BY A THIN LAYER
OF CONNECTIVE TISSUE.
Peritoneum
--BETWEEN THE TWO SHEETS
OF PERITONEUM ARE BLOOD
VESSELS, LYMPH VESSELS, AND
NERVES
--LARGEST SEROUS MEMBRANE
IN THE BODY
The Peritoneum develops ultimately from
the mesoderm of the trilaminar embryo.
Embryological Development of
Peritoneum
etymology
Greek: Peri- around, -ton- stretching.
peritoneum means stretched around or
stretched over.
The suffix -enteries is Greek word (enteron),
meaning gut or entrails or intestines
If this organ is invaginated far enough into the peritoneum, the visceral peritoneum will come in contact with
itself,
forming the organ's mesentery.
Visceral peritoneum will often surround all but a part of the organ ("bare area")
through which the organ transmits blood vessels and nerves
The Peritoneum invaginates at certain parts,
with an organ inside the invagination.
Relating Structures
"intraperitoneal" (e.g. the stomach)
"retroperitoneal" (e.g. the kidneys)
"subperitoneal" or "infraperitoneal"
(e.g. the bladder).
The mesentery comes from the embryologic structure the dorsal mesentery. The embryo also has a portion of tissue called the ventral mesentery, but this usually becomes part of the liver.
Embryological Development of
Mesentery
Mesenteries in our body:Mesentery (proper)
Mesocolon
Meso-appendix
Transverse mesocolon
Sigmoid mesocolon
Mesovarium
Mesometrium
Mesosalpinx
Collagen type I fibers are thick and stain a darker red hue, while elastic fibers are thin and form black
crisscrosses across the tissue. The nuclei can be seen as a distinct purple hue, as well as erythrocyte
clumps that are embedded within the mesh-work of fibers. The cells are widely disperse in the
extracellular matrix, made up of ground substance and the fibers, which comprises most of the tissue.
Most of the cells found here are fibroblasts, which produce the fibers in the extracellular matrix.
Mesenteric lymphadenitis
A.k.a. Mesenteric adenitis: inflammation of the
lymph nodes in mesentery
usually results from an intestinal infection.
occurs mainly in children and teens
often mimics the signs and symptoms of
appendicitis.
Unlike appendicitis, however, mesenteric
lymphadenitis is seldom serious and clears on
its own.
•Inadequate blood flow to the mesentery
•Can lead to mesenteric infarction
•More common in the elderly
•Severe abdominal pain and the presence of blood in the stool.
Causes:
Sudden drop In blood pressure, Atherosclerosis, Embolus formation
Mesenteric Ischemia
IN CORPULENT PERSONS THE
MESENTERY, LIKE THE GREATER
OMENTUM, CONTAINS AN
ADDITIONAL QUANTITY OF FAT.
THIS INCREASED WEIGHT
TENDS TO ELONGATE THE
MESENTERY BY DRAGGING, AND
THEREFORE PREDISPOSES TO
HERNIA.