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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

Sigmoid colon is often used because of its mobility

May ablate the pelvic nerve plexus --> loss of ejaculation, erection, urine retention, ⬇️ peristalsis in the remaining colon

Colostomy