Chapter 5 - Large Intestines

Question 1

Longitudinal muscle bands in LI

Answer 1

1. Taenia libera
2. Taenia mesocolica
3. Taenia omentalis

Question 2

Taenia libera orientation

Answer 2

Anteriorly on caecum, ascending, descending, sigmoid colon

Inferiorly on transverse colon

Question 3

Taenia mesocolica orientation

Answer 3

Postero medially on caecum, ascending, descending, sigmoid colon
Posteriorly on transverse colon

Question 4

Taenia omentalis orientation

Answer 4

Postero laterally on caecum, ascending, descending, sigmoid colon
Superiorly on transverse colon

Question 5

Blood supply of colon

Answer 5

Marginal artery of Drummond
Formed by branches of sup. and inf. mesenteric A
Terminal branches are distributed as vasa longa and vasa brevia

Question 6

Lymphatic drainage of colon

Answer 6

1. Epiploic ln
2. Paracolic
3. Intermediate
4. Terminal

Question 7

Nerve supply of LI

Answer 7

Midgut
Sym - Coeliac, Sup. mesenteric ganglia (T11 - L1)
Parasym - Vagus

Hindgut
Sym - Lumbar chain (L1,2)
Parasym - Pelvic splanchnic N

Question 8

Dimensions of caecum

Answer 8

6cm long

7.5cm broad

Question 9

Relations of caecum

Answer 9

Ant: Intestinal coils, Ant. abdominal wall
Post:
1. Right psoas, iliacus M
2. Genitofemoral, femoral, lateral cutaneous N of thigh
3. Testicular/ovarian vessels

Question 10

Blood and Nerve supply of caecum

Answer 10

Ileocaecal A
Sup. mesenteric V
T11 - L1 N, Vagus N

Question 11

Dimensions of appendix

Answer 11

Avg 9cm

Longer in children

Question 12

11 o clock position of appendix called

Answer 12

Paracolic

Question 13

12 o clock position of appendix called

Answer 13

Retrocolic

Commonest

Question 14

2 o clock position of appendix called

Answer 14

Splenic
Can be preileal or postileal
Preileal dangerous

Question 15

3 o clock position of appendix called

Answer 15

Promonteric

Question 16

4 o clock position of appendix called

Answer 16

Pelvic

Question 17

6 o clock position of appendix called

Answer 17

Subcaecal/midinguinal

Question 18

Blood supply of appendix

Answer 18

Appendicular A which is branch of ileocolic A
Anastamoses with post. caecal A
Drained by appendicular, ileocolic, sup. mesenteric V

Question 19

Nerve supply of appendix

Answer 19

T9 - T10 thru coeliac plexus
Vagus
Pain referred to umbilicus

Question 20

Relations of ascending colon

Answer 20

A: SI coils, Right edge of greater omentum, AAW

P: Iliacus, Quadratus lumborum, Tranversus abdominis, Right kidney, Lateral cutaneous N, Ilioinguinal N, Iliohypogastric N

Question 21

Relations of transverse colon

Answer 21

A: Greater omentum, AAW

P: 2nd part of duodenum, Head of pancreas, SI coils

Question 22

Relations of descending colon

Answer 22

A: SI coils

P: Iliacus, Psoas, Quadratus lumborum, Tranversus abdominis, Lateral cutaneous N, Ilioinguinal N, Iliohypogastric N, Femoral N, Genitofemoral N