Lecture 24: Equine and Ruminant Foregut

Question 1

what demarcates the non-glandular and glandular region of the horse stomach

Answer 1

margo plicatus

Question 2

where does the dorsal mesentary (and hingut organs) develop in ruminants

Answer 2

right abdominal cavity

Question 3

what is the abdomasum

Answer 3

the first glandular region of the stomach

Question 4

what is the forestomach / proventriculus composed of

Answer 4

rumen, reticulum, omasum and non-glandular stomach

Question 5

what is the pathway through the stomach of ruminants

Answer 5

esophagus –> rumen + reticulum –> omasum –> abomasum –> duodenum

Question 6

the omasum receives broken down ingesta from where

Answer 6

the rumen and reticulum

Question 7

is the newborn’s rumen functional?

Answer 7

no, it is non functional
there is a reticular fold/groove that shunts milk from the esophagus to the abomasum

Question 8

where does the abomasum receive ingesta from

Answer 8

omasum

Question 9

where does the 1st part of the duodenum receive bile and pancreatic juices from

Answer 9

bile comes from common bile duct

pancreatic juices come from pancreas via the main and accessory pancreatic ducts

Question 10

where do the common bile ducts and main pancreatic duct meet and drain into the duodenum

Answer 10

at the major duodenal papilla

Question 11

what substances does the pyloric gland release

Answer 11

gastin and mucous

Question 12

what is gastrin, what does it do

Answer 12

peptide hormone that stimulates parietal cells and aids in gastric mobility

Question 13

what is the mucosa of the duodenum characterized by

Answer 13

prominent villi and crypts of interstitial glands

Question 14

what do brunner’s glands secrete

Answer 14

alkaline mucous that lowers the acidity in the first part of the duodenum