L39: Oral Mucosa

Question 1

Name the 3 types of oral mucosa.

Answer 1

• Lining;
• Masticatory;
• Gustatory.

Question 2

Which oral mucosae are keratinised?

Answer 2

• Masticatory is parakeratinised;

- Gustatory is keratinised.

Question 3

What type of oral mucosa is lining mucosa?

Answer 3

Non-keratinised

Question 4

Where is lining mucosa found?

Answer 4

• Buccal (cheeks);
• Labial (inside lining of lips);
• Alveolar (between buccal and labial).

Question 5

What type of oral mucosa is masticatory mucosa?

Answer 5

Para-keratinised

Question 6

Where is masticatory mucosa found?

Answer 6

• Hard palate;

- Attached gingiva

Question 7

What type of oral mucosa is gustatory mucosa?

Answer 7

Keratinised

Question 8

Where is gustatory mucosa found?

Answer 8

Dorsum (front) of the tongue only

Question 9

Explain the structure of oral mucosa.

Answer 9

• ! Epithelium (stratified squamous);
• ! Lamina propria;
• Submucosa.

Question 10

Explain the structure of epithelium.

Answer 10

• Stratum corneum;
• Stratum granulosum;
• Stratum spinosum (prickle-cell layer);
• Stratum germinativum (basal layer).

C-G-S-G

Question 11

In keratinised epithelium, where is keratin produced?

Answer 11

Stratum granulosum

Question 12

What is the difference between keratinised and non-keratinised cells?

Answer 12

Keratinised cells have no nucleus or organelles, i.e. dead cells, filled with keratin protein

Question 13

What type of cells produce keratin?

Answer 13

Keratinocytes

Question 14

What are melanocytes?

Answer 14

Pigment (melanin) producing cells

Question 15

What are langerhans cells?

Answer 15

Dendritic, antigen presenting cells, of the mucosa/ skin

Question 16

What are the 4 types of lingual papillae?

Answer 16

• Filiform;
• Fungiform;
• Foliate (minor)
• (Circum)vallate.

Question 17

What is the most common type of lingual papillae?

Answer 17

Filiform

Question 18

Which papillae do not contain tastebuds?

Answer 18

Filiform

Question 19

Which papillae are shaped in a V and what does this divide?

Answer 19

Circumvallate, in front: anterior 2/3, behind: posterior 1/3

Question 20

What portion of the tongue contains papillae?

Answer 20

Anterior 2/3

Question 21

What are lingual papillae

Answer 21

Localised projections of underlying connective tissue (lamina propria), some containing taste buds

Question 22

What is present in the lamina propria (connective tissue)?

Answer 22

LamiNa CaprIa

• Lymphatics;
• Nerves;
• Capillaires;
• Immune cells, IgA.

Question 23

Which lingual papillae are have a thick keratinised layer?

Answer 23

Filiform

Question 24

What layer or the oral mucosa are tastebuds found in?

Answer 24

Epithelium

Question 25

Where are foliate papillae found?

Answer 25

Posterior, lateral borders of tongue

Question 26

How many circumvallate papillae do we have?

Answer 26

8-12

Question 27

What is geographical tongue?

Answer 27

• A harmless condition;
• Presents a map-like appearance on the surface of the tongue;
• Red and white patches with missing papillae;
• Often asymptomatic (no Tx required), sometimes patients experience pain.

Question 28

What are the two other names for geographic tongue?

Answer 28

• Benign migratory glossitis;

- Glossitis migrans.

Question 29

What tissue layers give rise to a ‘mucosa’?

Answer 29

Epithelium and lamina propria

Question 30

What type of connective tissue is lamina propria?

Answer 30

Loose