Large Intestine: Vermiform Appendix

Question 1

Site of Vermiform Appendix

Answer 1

at the Right Iliac fossa Extending from Posteromedial Apsect of Caecum 1 inch below and lateral to Ileocaecal Valve

Question 2

Nickname for Appendix

Answer 2

Abdominal Tonsil, as its walls are rich in lymphoid tissue

Question 3

Describe surface anatomy of Vermiform appendix

Answer 3

known as McBurney’s point;
* Imaginary line between umbilicus & ASIS
* Junction between lateral 1/3 and medial 2/3 of that imaginary line

Question 4

Most common appendix Position

Answer 4

Retrocaecal (75% of the population)

Question 5

Describe Pelvic Postion of Vermiform Appendix

Answer 5

Appendix hangs down over pelvic brim/ opening, can be directly related to right uterine tube & ovary in female
* 20 % of population

Question 6

Describe Subcaecal Position of the Vermiform Appendix

Answer 6

It lies horizontally just below Caecum
* In 3% of population

Question 7

Describe Preileal/postileal Postion of Vermiform Appendix

Answer 7

Appendix passes either in front or behind terminal Ilium
* 2% of population

Question 8

Describe Retrocolic Postion of Vermiform Appendix

Answer 8

Lies behind (deep to) ascending Colon

Question 9

Describe Subhepatic Postion of Vermiform Appendix

Answer 9

In congenital short ascending Colon, the appendix lies under the liver

Question 10

Peritoneal Covering of the Appendix

Answer 10

Mesoappendix

Question 11

Attachement of mesoappendix

Answer 11

• it’s base is attached to back of lower end of Small intestine mesentery
• Right & left borders are free

Question 12

Contents of Mesoappendix

Answer 12

• Vermiform Appendix (at right free border)
• Appendicular Vessels (left free border)
• Lymph nodes & vessles
• Sympathetic & para sympathetic fibers

Question 13

Arterial Supply of Appendix

Answer 13

Appendicular Artery: astermination of Ileocolic A, which is a branch from Sup. Mesenteric A, it runs in the Left free border of Mesoappendix

Question 14

Venous Drainage of Appenix

Answer 14

Appendicular V: drains into ileocolic V which drains into Sup. mesenteric V (portal Circulation)

Question 15

Nerve supply of Appendix

Answer 15

• Parasympathetic: Vagus N
• Sympathetic: Superior mesenteric plexus

Question 16

sensory fibers and pain fibers of Appendicx are carried in the ____ supply of the appendix, which also supplies ____

Answer 16

Sympathetic supply, skin around umbilicus