Flashcards in Sigmoid Colon Deck (5)
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Aganglionic megacolon
Absence of neural crest cells in myenteric plexus
Absence of peristalsis, fecal retention, abdominal distention
Hirchsprung's disease
1
Between descending colon and rectum
Begins at S1 (sacral promontory, pelvic inlet) & ends at S3 (rectosigmoid junction), where taenia coli are replaced by circular later of smooth muscle
Intraperitoneal, suspended by sigmoid mesocolon
- L ureter & L common iliac artery at the apex of sigmoid mesocolon
Blood supply: sigmoid arteries & rectosigmoid artery
Venous drainage: sigmoid vein --> inferior mesenteric vein --> hepatic portal system
Sigmoid colon
2
Presence of diverticula (pouches or sacs)
MC: sigmoid colon
>60 year old, low fiber, western diet
Perforation/inflammation of diverticula --> diverticulitis
Diverticulosis
3
Examination of sigmoid colon & rectum
At rectosigmoid junction, the sigmoid colon bends in anterior direction & to the left
Flexible sigmoidoscopy
4
