5. GIT tract- pig

Question 1

what type of stomach does a pig have?

Answer 1

simple composite stomach

Question 2

Describe the topographical relationships of the pig stomach

Answer 2

• has glandular and non glandular parts
• has gastric diverticulum
• cardiac portion is thin-walled and intrinsically immobile and non-glandular
• oesophagus and pyloric regions are very close- small lesser curvature
• torus pyloric is firm and tough
• has rugae

Question 3

what is the gastric diverticulum?

Answer 3

fundic extension that distinguishes pig stomach from other species

Question 4

what are rugae in the stomach?

Answer 4

ridges that increase surface area of the stomach and stretch out to increase stomach volume when stomach is full

Question 5

describe the pig large intestine

Answer 5

• spiral colon // three dimensional
• Base of the spiral colon lies dorsal position
• Ascending colon is arranged in a cone around its mesentery
• Outer part of the cone is wider and sacculated (centripetal)
• inner part- Centrifugal coils concealed within the centre of the cone

Question 6

describe the pig colon

Answer 6

• no villi
• mucosal surface relatively flat
• colonic mucosal epithelium contains goblet cells
• mucosa lined with simple columnar epithelium

Question 7

describe the pig GIT

Answer 7

• Most jejunum lies largely to the right
• mesentery is much shorter in pig jejunum
• Caecum is on the left hand side
• large intestine has bands and sacculations but more subtle
• Spleen is loosely attached to the greater curvature and lies in a dorso-ventral orientation