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Stomach: In humans, stomach has four parts: 1.The mucosa within the stomach is also different from the rest of the digestive tract.The extra muscle layer facilitates the churning, mixing and mechanical digestion of food that occurs within the stomach, as well as supporting the onward journey of the food by peristalsis.The stomach is supplied with arterial blood from a branch of the celiac artery, and venous blood leaves the stomach via the hepatic vein.The vagus nerve innervates the stomach with parasympathetic fibres that stimulate gastric motility and the secretion of gastric juice.The body region occupies the space between the lesser and greater curvature of the stomach, and the pyloric region narrows into the pyloric canal.Sympathetic fibres from the celiac plexus reduce gastric activity.It has longitudinal, circular and oblique muscle fibres.

Stomach: In humans, stomach has four parts:

1. Cardiac region, 2.Fundus 3. Body or corpus 4.Pyloric region
   The stomach lies in the abdominal cavity. It lies between the oesophagus
   superiorly and the duodenum of the small intestine inferiorly. It is divided into
   regions. The entrance to the stomach from the oesophagus is via the lower
   esophageal sphincter or cardiac sphincter. This leads to a small area within the
   stomach called the cardiac region or cardia.
   The fundus is the dome‐ shaped region in the superior part of the stomach. The
   body region occupies the space between the lesser and greater curvature of the
   stomach, and the pyloric region narrows into the pyloric canal. The pyloric
   sphincter controls the exit of chyme from the stomach into the small intestine.
   Chyme is the name given to the food bolus as it leaves the stomach. The stomach is
   supplied with arterial blood from a branch of the celiac artery, and venous blood
   leaves the stomach via the hepatic vein. The vagus nerve innervates the stomach
   with parasympathetic fibres that stimulate gastric motility and the secretion of
   gastric juice. Sympathetic fibres from the celiac plexus reduce gastric activity.
   The stomach has the same four layers of tissue as the digestive tract, but with some
   differences.
   The muscularis contains three layers of smooth muscle instead of two. It has
   longitudinal, circular and oblique muscle fibres. The extra muscle layer facilitates
   the churning, mixing and mechanical digestion of food that occurs within the
   stomach, as well as supporting the onward journey of the food by peristalsis. The
   mucosa within the stomach is also different from the rest of the digestive tract.