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Old 07-20-2014
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Star Lymph drainage help!

Hey guys, need help understanding lymph drainage of the colon....

my understanding of sigmoid colon lymph drainage is to inf. mesenteric via colic...

I just had a question about this on NBME 16...and i chose left colic instead of inf. mesenteric...and I don't understand why inf. mesenteric is more appropriate response...

any help is GREATLY appreciated!
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Old 07-21-2014
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The lymphatic vessels of the ascending colon end in the ileocolic nodes, while those of the transverse colon end in right colic and middle colic nodes. They all enter the superior mesenteric nodes. The lymphatic vessels of the descending colon enters the left colic nodes while those of sigmoid colon enter the sigmoid nodes. They all end in the inferior mesenteric nodes. The inferior mesenteric nodes and the superior mesenteric nodes are all part of the pre-aortic nodes. The efferents pass into the intestinal lymph trunks, which then enter the cisterna chyli or the abdominal confluence of lymph trunks. The cisterna chyli drains into the thoracic duct.

Sigmoid is the part of hindgut which is supplied by inferior mesenteric artery.. So its drainage is also from these nodes i guess..
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Old 07-21-2014
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thank you for the detailed explanation! Just what i needed.
I assumed it was through the colic first ( according to FA2012 pg.222), but i guess Inf. mesenteric is the best possible answer.
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