The Stomach of a Sheep
Ruminants (those animals that chew the cud), as the sheep, have a stomach with four cavities. Labels: 1, esophagus; 2, rumen; 3, reticulum; 4, omasum; 5, abomasum or rennet; 6, intestine.
Cutter, Calvin First Book on Analytic Anatomy, Physiology and Hygiene, Human and Comparative (Philadelphia: J. B. Lippincott & Co., 1875) 69