Pelvic Colon Flashcards
1
Q
Site
A
- Begins: in left iliac fossa at pelvic brim as continuation of descending colon
- Ends: in pelvic cavity opposite 3rd sacral piece by becoming continuous with rectum
2
Q
Shape
A
S-shaped
3
Q
Length
A
15-20 inches long
4
Q
Peritoneal covering
A
Completely covered by peritoneum and has triangular shaped mesentery (pelvic or sigmoid mesocolon)
5
Q
Pelvic mesocolon
A
Peritoneal fold formed of 2 layers attaching pelvic colon to upper part of pelvis posterior wall
6
Q
Borders
A
- Free border
- Attached border (root): 2 limbs (lateral and medial)
7
Q
Free border
A
Contains sigmoid colon
8
Q
Lateral limb
A
- Attached to lateral external iliac vessels medial side alone line starting 2 inches above Inguinal ligament
- Ascend upwards to bifurcation point of left common iliac artery
9
Q
Medial limb
A
- Descends from apex till 3rd sacral piece being attached to front of sacrum
- Apex crosses in front of left ureter at left common iliac artery bifurcation
10
Q
Intersigmoid recess site
A
- Lies deep to pelvic mesocolon apex
- Its opening downwards
11
Q
Contents
A
- Sigmoid colon in free border
- Sigmoid vessels in lateral limb
- Superior rectal vessels in medial
- Lymph vessels and nodes
- Autonomic fibers
- Extraperitoneal fat
12
Q
Relations: below
A
- Urinary bladder in both sexes
- Uterus in female
13
Q
Relations: posterior
A
- Left piriformis
- Sacral plexus
- Left ureter
- Left internal iliac vessels
14
Q
Relations: above and medial
A
Ileum coils
15
Q
Relations: lateral
A
Pelvis lateral wall separated from sigmoid colon by the following:
1. Left external iliac vessels
2. Obturator nerve and vessels
3. Left ovary (in female) or left vascular deferens (in males)
