In the cat, the esophagus lies behind the trachea (as it does in humans).
The esophagus provides a passageway for food to the stomach, which lies below the diaphragm in the abdominal_cavity.
Extending from the upper curvature (lesser_curvature) of the stomach is the lesser_omentum. The greater_omentum extends from the greater_curvature of the stomach down over the abdominal organs.
The liver and gall_bladder are below the diaphragm and conceal part of the stomach. If you reflect the liver you can find the pancreas lying in the mesentery that supports the intestines.
The small_intestine (duodenum, jejunum, and ileum) extends from the base of the stomach to the cecum of the colon.
The spleen (which is lymphatic, not digestive) is clearly visible on the left side of the abdomen.