The superior mesenteric lymph nodes may be divided into three principal groups: * mesenteric lymph nodes * ileocolic lymph nodes * mesocolic lymph nodes

Structure

Mesenteric lymph nodes

The mesenteric lymph nodes or mesenteric glands are one of the three principal groups of superior mesenteric lymph nodes and lie between the layers of the

mesentery In human anatomy, the mesentery is an Organ (anatomy), organ that attaches the intestines to the posterior abdominal wall, consisting of a double fold of the peritoneum. It helps (among other functions) in storing Adipose tissue, fat and allowi ...

. They number from one hundred to one hundred and fifty, and are sited as two main groups: * one ileocolic group lying close to the wall of the

small intestine The small intestine or small bowel is an organ (anatomy), organ in the human gastrointestinal tract, gastrointestinal tract where most of the #Absorption, absorption of nutrients from food takes place. It lies between the stomach and large intes ...

, among the terminal twigs of the superior mesenteric artery; * a second larger mesocolic group placed in relation to the loops and primary branches of the vessels.

Ileocolic lymph nodes

The ileocolic lymph nodes, from ten to twenty in number, form a chain around the ileocolic artery, but tend to subdivide into two groups, one near the

duodenum The duodenum is the first section of the small intestine in most vertebrates, including mammals, reptiles, and birds. In mammals, it may be the principal site for iron absorption. The duodenum precedes the jejunum and ileum and is the shortest p ...

and the other on the lower part of the trunk of the artery. Where the vessel divides into its terminal branches the chain is broken up into several groups: * (a) ileal, in relation to the ileal branch of the artery; * (b) anterior ileocolic, usually of three glands, in the ileocolic fold, near the wall of the

cecum The cecum ( caecum, ; plural ceca or caeca, ) is a pouch within the peritoneum that is considered to be the beginning of the large intestine. It is typically located on the right side of the body (the same side of the body as the appendix (a ...

; * (c) posterior ileocolic, mostly placed in the angle between the

ileum The ileum () is the final section of the small intestine in most higher vertebrates, including mammals, reptiles, and birds. In fish, the divisions of the small intestine are not as clear and the terms posterior intestine or distal intestine may ...

and the colon, but partly lying behind the cecum at its junction with the ascending colon; * (d) a single gland, between the layers of the mesenteriole of the appendix; * (e) right colic, along the medial side of the

ascending colon In the anatomy of humans and homologous primates, the ascending colon is the part of the colon located between the cecum and the transverse colon. Characteristics and structure The ascending colon is smaller in calibre than the cecum from wh ...

Mesocolic lymph nodes

The mesocolic lymph nodes are numerous, and lie between the layers of the transverse mesocolon, in close relation to the transverse colon; they are best developed in the neighborhood of the right and left colic flexures. One or two small glands are occasionally seen along the trunk of the right colic artery and others are found in relation to the trunk and branches of the middle colic artery.

Function

The superior mesenteric glands receive lymph from the

jejunum The jejunum is the second part of the small intestine in humans and most higher vertebrates, including mammals, reptiles, and birds. Its lining is specialized for the absorption by enterocytes of small nutrient molecules which have been pr ...

, vermiform process, and the ascending and transverse parts of the colon; lymph drains into the preaortic glands.

Additional images

File:Gray615.png, The lymphatics of cecum and vermiform process from the front. File:Gray616.png, The lymphatics of cecum and vermiform process from behind.

References

Lymphatics of the torso {{lymphatic-stub