ARYAM

ILYAS

What is Mesentery?

Clinicals

What is Peritoneum?

Functional Importance of

Mesentery

Formation of Mesentery

Histological Appearance of Mesentery

Lovely, isn’t it?

Histological Appearance

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

PERITONEUM ASSOCIATED

WITH THE INTESTINES IS

TERMED AS MESENTERY.

INTESTINES: HEM

MESENTERY: DRAPES

FORMATION OF

MESENTERY

PARIETAL PERITONEUM

VISCERAL PERITONEUM

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

Histologically,

Mesentery is

Loose Areolar Connective

Tissue

Cells

Fibers

Ground Substance

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.

Job

Keeping the guts in place

Limiting gut movement

protection from injury

Conduit

--BLOOD VESSELS

--LYMPH VESSELS N NODES

--NERVES

CL

INIC

AL

S

Mesentery of a mouse

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

Arterial supply of

MesenteryMesenteric 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.

Pakoray or…….?

"I LIKE

NONSENSE, IT

WAKES UP THE

BRAIN CELLS."

---DR. SEUSS