amniotic fluid
Blood
The mother sow provides all the nutrients needed by the fetus until birth. Directly into the blood stream.
Simply because it is closer to the heart. Cardiac refers to the heart.
There is a very good reason there is no food found in a fetal pig's stomach. The fetal pig was never born.
The human stomach is bigger than the fetal pig's. This of course is if the human is an adult human.
food
In the fetal pig, the esophageal opening is located dorsal to the glottis. The esophagus lies to the top of the stomach, in close proximity to the diaphragm.
The greenish substance in the stomach of a fetal pig is typically bile. Bile is produced by the liver and stored in the gallbladder before being released into the small intestine to aid in the digestion of fats.
esophageal, cardiac, and pyloric
Rugae
Meconium
The inner wall of the stomach of the fetal pig is lined with gastric mucosa, which contains gastric pits leading to gastric glands. These gastric glands secrete enzymes and mucus that aid in digestion. The lining also has rugae, which are folds that allow for expansion of the stomach.