Sigmoid mesocolon
Encyclopedia
The sigmoid mesocolon is the fold of peritoneum
which retains the sigmoid colon
in connection with the pelvic wall.
Its line of attachment forms a V-shaped curve, the apex of the curve being placed about the point of division of the left common iliac artery
.
The curve begins on the medial side of the left Psoas major, and runs upward and backward to the apex, from which it bends sharply downward, and ends in the median plane at the level of the third sacral vertebra.
The sigmoid and superior hemorrhoidal vessels run between the two layers of this fold.
This binds the large intestine to the posterior abdominal wall.
It also carries blood and lymphatic vessels to the intestines.
Together, the mesentary and mesocolon hold the intestines loosely in place, allowing movement as muscular contractions mix and move the luminal contents along the G.I. tract.
Peritoneum
The peritoneum is the serous membrane that forms the lining of the abdominal cavity or the coelom — it covers most of the intra-abdominal organs — in amniotes and some invertebrates...
which retains the sigmoid colon
Sigmoid colon
The sigmoid colon is the part of the large intestine that is closest to the rectum and anus. It forms a loop that averages about 40 cm...
in connection with the pelvic wall.
Its line of attachment forms a V-shaped curve, the apex of the curve being placed about the point of division of the left common iliac artery
Common iliac artery
The common iliac arteries are two large arteries that originate from the aortic bifurcation at the level of the fourth lumbar vertebra. They bifurcate into the external iliac artery and internal iliac artery ....
.
The curve begins on the medial side of the left Psoas major, and runs upward and backward to the apex, from which it bends sharply downward, and ends in the median plane at the level of the third sacral vertebra.
The sigmoid and superior hemorrhoidal vessels run between the two layers of this fold.
This binds the large intestine to the posterior abdominal wall.
It also carries blood and lymphatic vessels to the intestines.
Together, the mesentary and mesocolon hold the intestines loosely in place, allowing movement as muscular contractions mix and move the luminal contents along the G.I. tract.