Large Intestine: Sigmoid (pelvic) Colon

Question 1

Beginning of sigmoid colon

Answer 1

at Left Iliac fossa at left border of pelvic brim, as continuation of Descending colon

Question 2

End of Sigmoid colon

Answer 2

Opposite level of 3rd sacral piece, continuous with rectum

Question 3

Length of sigmoid colon 15-20 inches long

Answer 3

15-20 inches long

Question 4

Periosteal covering of sigmoid colon

Answer 4

sigmoid mesocolon

Question 5

Attachement of Lateral limb of Attached border of Sigmoid mesocolon

Answer 5

Left External Iliac Vessels, along a line from:
* 2 inches above left inguinal ligmanet to
* Bifurication of left Common iliac A

Question 6

Attachement of Medial limb of Attached border of Sigmoid mesocolon

Answer 6

front of Sacrum, from apex to 3rd Sacral Piece

Question 7

Contents of Sigmoid mesocolon

Answer 7

1. Sigmoid colon (free border)
2. Sigmoid vessels (originally Lower left Colic Vessels)= in lateral limb
3. Superior rectal vessels = in medial limb
4. Exteraperitoneal fat
5. Lymph nodes and vessels
6. Sympathetic and parasymathetic plexuses

Question 8

inferior relations of Sigmoid colon

Answer 8

• Urinary Bladder
• Uterus (in female)

Question 9

Superior relations of Sigmoid colon

Answer 9

Coils of Ileum

Question 10

Medial relations of Sigmoid colon

Answer 10

Coils of Ileum

Question 11

Lateral relations of Sigmoid colon

Answer 11

Lateral wall of pelvis, with 3 structures in between:
* left External Iliac vessles
* left Obturator Nerve & vessels
* Left Ovary (in female) or left Vas deferens (in male)

Question 12

Arterial Supply of Sigmoid Colon

Answer 12

Sigmoid Artery (originally lower left colic A), which anastomose with Superior Rectal A

Question 13

Venous Drainage of Sigmoid Colon

Answer 13

Sigmoid Veins which Drain into Inferior mesenteric V (portal Circulartion)