Lab10_SalivaryGlands, Liver & Pancreas

Question 1

What are the main differences between Mucous and Serous gland cells?

Answer 1

Serous glands:
- Smaller lumen
- Tall pyramidal cells, basally located spherical nucleus
- eosinophilic zymogen granules at the apex
Mucous glands:
- Larger lumen
- Pyramidal shaped cells
- basally located flattened nucleus
- Mucin droplets

*mixed ainus = mucous + serous demilunes

Question 2

What are the 3 salivary glands?

Answer 2

1. Parotid gland → 100% serous / Branched acinar gland
2. Submandibular gland → 90% Serous + 10% Mucous / compound tubulo-acinar gland
3. Sublingual gland → 100% mucous + some mucous with serous demilunes

Question 3

What is the general plan of the salivary glands? (duct system)

Answer 3

Main excretory duct ← Interlobar duct ← Interlobular duct ← Striated duct ← Intercalated duct

Intercalated duct = smallest, simple squamous/cuboidal

Striated duct = same size than acinus, cuboidal to columnar, interdigitated cells, striations = membrane infolding + mitochondria

Question 4

What are the main differences between Pancreas and Parotid gland?

Answer 4

• No striated duct in the pancrease (only intercalated)
• Islet of Langerhan in Pancreas
• Centroacinar cells in Pancreas