As stated previously, the stomach of a ruminant contains four parts: rumen, reticulum, omasum, and the abomasum.
For the first three stomach parts, their linings contain no glands. They soak the food and allow microbial digestion
to take place. The reticulum is the forward most portion of the ruminant stomach. Its inner surface consists of many
inward folds that are honeycomb-like in shape. A groove, called the esophageal groove, extends from the cardia to
the omasum. It is capable of closing the entrance of the rumen and reticulum. Specifically, this causes consumed
food to bypass these two parts and travel directly to the omasum.