L11 Caecum, Appendix and Colon Flashcards
Most likely spot for obstruction of the colon?
Sigmoid Colon
What does the Superior Mesenteric Artery Supply?
*Caecum
*Appendix
*Ascending colon
*Transverse colon (2/3)
What does the Inferior Mesenteric Artery Supply?
- Transverse colon (1/3)
- Descending colon
- Sigmoid colon
- Rectum & anal canal
Sign of Colon Cancer?
Apple-Core Sign
Widest part of the Colon
Cecum
Venous Drainage of the Colon?
Innervation of the Ascending and Transverse Colon?
SYMPATHETIC + PARASYMPATHETIC
via superior mesenteric plexus from posterior vagal trunk and lower thoracic splanchnic
Innervation of the Descending and Sigmoid Colon?
SYMPATHETIC
Via superior/inferior mesenteric and superior hypogastric plexuses from thoracic and lumbar splanchnics
PARASYMPATHETIC
Via inferior hypogastric plexuses from S2-S4 pelvic splanchnics
What opposes during colonic peristalsis, particularly mass movements?
Ileocaecal Junction
Vermiform blind ending diverticulum arising most frequently from posteromedial aspect of caecum?
Base Location?
Apendix
Base location: McBurney’s point
Relationships of the Cecum?
Anterior: anterior abdominal wall and loops of small interesting
Posterior: Iliopsoas, lateral femoral cutaneous nerve
Posteromedial: Femoral nerve and external iliac vessels
Relationships of the Ascending Colon?
Retroperitoneal
Anterior : Small Intestine
Posterior : Iliacus, quadratus lumborum & lower pole of right kidney
Blood Supply/Venous Drainage of Ascending Colon?
SMA (ileocolic and right colic arteries)
SMV (ileocolic and right colic veins)
Relationships of the Transverse Colon?
Intraperitoneal
Anterior: Liver & GB, stomach, spleen, greater omentum
Posterior: Small intestine (D2), & pancreas
The transverse colon travels _______peritoneally from the __________ flexure to __________flexure attaching to the ___________ ligament
The transverse colon travels INTRAperitoneally from the right colic (hepatic) flexure to the left colic (splenic) flexure attaching to the phrenicocolic ligament
The Ascending colon travels _______peritoneally from the _________________ending at _______________ flexure. It has a paracolic gutter leading to _________________
The Ascending colon travels RETROperitoneally from right hypochondrium ending at right colic/hepatic flexure. It has a paracolic gutter leading to subphrenic space
Relationships of the Descending Colon?
Retroperitoneal
Anterior: Small intestine
Posterior: Diaphragm, left kidney, quadratus lumborum and iliacus
What marks the midgut/hindgut watershed?
Left colic flexure (Transverse/Descending Colon transition)
Sigmoid colon begins above the ______travels _______peritoneally to _______ sacral segment.
It is ______ -shaped with long mesentery tapering towards rectum (_______________)
Sigmoid colon begins above the pelvic inlet travels intraperitoneally to 3rd sacral segment.
It is S-shaped variable length with long mesentery tapering towards rectum (sigmoid mesocolon)
