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Colon
notes
15
Anatomy
Graduate
09/28/2011

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Term
What are taeniae coli?
Definition
1) Outer longitudinal muscle oriented into 3 strips

2) cause irregular bulges in colon
- haustra
Term
What are epiploic appendages?
Definition
1) associated with taeniae coli
Term
Plicae semilunares:
Definition
1) Mucosa & submucosa
Term
Bare areas:
Definition
1) post. surface of ascending & descending colon

2) no serosa here (retroperitoneal)
Term
What does the ascending branch of the right colic artery anastomose with?
Definition
1) The right branch of the middle colic artery
Term
What does the left branch of the middle colic artery supply?
Definition
The splenic flexure
Term
At what vertebral level does the Superior Mesenteric Artery branch off of the aorta? The Inferior Mesenteric?
Definition
1) L1

2) L3
Term
Is the left colic artery peritoneal or retroperitoneal?
Definition
1) retroperitoneal
Term
When does the IMA become the Superior Rectal Artery?
Definition
1) Once it crosses the pelvic brim
- supplies proximal rectum
Term
What two plexi innervate the colon?
Definition
Superior & Inferior mesenteric plexi
Term
What does the superior mesenteric plexus supply?
Definition
1) Post-ganglionic sympathetics

2) Pre-ganglionic vagal parasympathetics
Term
What does the inferior mesenteric plexus supply?
Definition
1) Post-ganglionic sympathetics

2) Pre-ganglionic pelvic splanchnic (parasympathetic)
- S2-4

3) Inf. Mes. Plexus continues downward as:
- aortic plexus to aortic bifurcation
Term
What does the Inf. Mes. Plexus become?
Definition
1) Runs past aortic bifurcation and onto sacral promontory

2) Becomes Superior hypogastric plexus
Term
What is the Sup. Hypogastric plexus?
Definition
1) Branches into L & R Hypogastric nerves
- supply pelvic viscera
Term
What do the Hypogastric nerves form?
Definition
1) Inferior Hypogastric plexus (pelvic plexus)
- flanks rectum bilaterally
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