Anatomy of the Omasum, Abomasum and intestines The omasum is the third stomach of the goat. The abomasum is the fourth stomach and is similar to the stomach of a monogastric animal such as humans. The animation shows the function and anatomy of these organs. Additional animations explaining digestion in the goat. The mouth Surface anatomy of the four stomach chambers The rumen and reticulum The omasum and abomasum Rumen microbes Rumen Fermentation The Life Cycle of a Rumen Fungi Return to Goat Biology Animations Return to Goat Biology Home