Human Stomach

Quick Answer: The human stomach model is a replica of the stomach, usually opened or sectioned to show its inner lining, used to teach its regions, its muscular wall and its role in digestion. Biology, nursing and medical students use it to identify the cardia, fundus, body, pyloric antrum and pylorus.

Regions and Wall of the Stomach

The stomach is a J-shaped muscular bag between the oesophagus and the duodenum. Food enters at the cardia; the fundus bulges up beside it under the left dome of the diaphragm, where swallowed gas collects; and the large body leads down and to the right into the pyloric antrum and the narrow pyloric canal, which ends at the thick ring of the pyloric sphincter. The short concave border on the right is the lesser curvature and the long convex border on the left is the greater curvature.

Inside, the lining of an empty stomach is thrown into folds called rugae, which flatten as it fills. The wall has one more muscle layer than the rest of the gut: inner oblique, middle circular and outer longitudinal fibres, which together churn food with gastric juice into semi-liquid chyme. A sectioned human stomach model is the clearest way to show these layers and the thickened muscle at the pylorus.

The title does not state whether this model is sectioned, opens into halves or includes the start of the duodenum. A mounted version is also listed as the human stomach on stand.

Care & Handling

• If the human stomach model opens, close the halves gently and check that the pins line up before pressing them together.
• Wipe the inner lining with a soft, slightly damp cloth; the folds of the rugae trap dust.
• Keep it away from heat and direct sunlight to protect the painted detail.

Specifications

Applications

• Identifying the regions of the stomach in secondary biology digestion lessons
• Explaining how the three muscle layers mix food and move it towards the pylorus
• Nursing anatomy covering the gastro-oesophageal junction and the pyloric sphincter
• Introducing common peptic ulcer sites, the lesser curvature and the duodenum, in health science courses

Why Choose LabEquip

Biology teachers and nursing tutors turn to a separate stomach model when a whole digestive system model is too small to show the wall and lining. LabEquip lists it in its biology lab products with the full human digestive system model for the wider tract. Ask through the contact page about sectioning and size.

Frequently Asked Questions

What are the regions of the stomach?

From top to bottom they are the cardia around the oesophageal opening, the dome-shaped fundus, the large body, the pyloric antrum and the pyloric canal, which ends at the pyloric sphincter.

Why does the stomach have three muscle layers?

Most of the gut has circular and longitudinal muscle. The stomach adds an inner oblique layer, which allows the strong churning and twisting movements that mix food with gastric juice and break it down mechanically.

What are rugae?

Rugae are folds of the stomach lining seen when the stomach is empty. They let it expand greatly after a meal and flatten out as it fills.

What does the pyloric sphincter do?

It is a thickened ring of circular muscle at the outlet of the stomach. It opens briefly to let small amounts of chyme into the duodenum and helps stop intestinal contents flowing back.

Which cells produce stomach acid?

Parietal cells in the gastric glands of the body and fundus secrete hydrochloric acid and intrinsic factor, which is needed to absorb vitamin B12. Chief cells secrete pepsinogen, the precursor of the enzyme pepsin.

How does this differ from the stomach model on a stand?

Both represent the stomach. This version is listed without a stand, so it suits handling on the bench and passing round a group; the stand version is designed to be displayed upright in front of a class.

Last Updated: September 2026