L5 - Histology of Tongue and Salivary Glands

Question 1

Differentiate the two parts of the dorsal tongue in innervation and features

Answer 1

Oral part (Anterior ⅔)

• Taste fibres from facial nerve (CNVII)
• Lingual papillae (Filiform, Fungiform, Circumvallate, Foliate)

Pharyngeal part (Posterior ⅓)

• Taste fibres from glossopharyngeal nerve (CNIX)
• Lingual tonsils (lymph nodules)

Question 2

Purpose of filiform papillae?

Answer 2

Smallest and most abundant.

Keratinised surface.

Create rough surface of tongue to manipulate food.

Question 3

Purpose of fungiform papillae?

Answer 3

Non-keratinised surface.

A few taste buds.

Question 4

Purpose of circumvallate papillae?

Answer 4

Largest and least abundant.

Taste buds cover the lateral sides.

Excretory ducts of serous glands flush away particles.

Question 5

Purpose of foliate papillae?

Answer 5

Deep, lateral part has tastebuds.

Also have serous ducts.

Question 6

What are the three salivary glands?

Answer 6

1. Parotid
2. Sublingual
3. Submandibular

Question 7

What path does the secretion from the submandibular gland enter the mouth?

Answer 7

Submandibular duct connects to the lingual duct, shared with the sublingual gland.

Both excrete through the lingual duct.

Question 8

Describe the salivary duct system>

Answer 8

Intercalated ducts lead from acini to larger ducts - Striated ducts. These are both intralobular.

Striated ducts lead to interlobular ducts - larger, excretory ducts.

Question 9

What are the two types of salivary secretions, and which do the 3 salivary glands do?

Answer 9

Serous secretions - watery product with amylase enzyme.

Mucous secretions - viscous product.

Parotid = serous

Sublingual = mucous (closer to oral cavity as it is harder to move mucous)

Submandibular = both