The Stomach

Question 1

Stomach - Function

Answer 1

• Mixing compartment
• Storage
• Secreting gastric juices (contains mucus, HCl, pepsinogen)

Question 2

Stomach Epithelium

Answer 2

• Internal surface layer
• Simple columnar secretory epithelium
• Folded into millions of gastric pits

Question 3

Lamina Propria

Answer 3

• Loose connective tissue that lies between the internal surface of the stomach and the muscularis layer
• Rich in capillaries, lymphatic vessels, nerves and gastric glands

Question 4

Muscularis Mucosae

Answer 4

• Thin layer of smooth muscle between lamina mucosae and the submucosa in the stomach wall
• Contracts and compressed gastric glands to push contents into the lumen of the stomach

Question 5

Submucosa

Answer 5

• Connective tissue and vascular plexus which supplies to the mucosa

Question 6

Muscularis

Answer 6

• 3 layers
• oblique = deepest, covers the cardiac region of the stomach
• Circular = middle layer, encircles entire stomach
• Longitudinal = outer layer

Question 7

Serosa

Answer 7

• Outer surface is covered in a layer of peritoneum.

- Continuous superiorly

Question 8

Digestion - Mechanical

Answer 8

• Bolus of food is swallowed
• Leaves oesophagus and enters stomach lining
• Peristaltic mixing waves mechanically break down the bolus
• Mix with gastric juices (chyme)
• Contractions of muscle move digesting food toward the small intestine
• Gastric emptying