Ch. 9 Oral Mucosa & Tongue Flashcards

Flashcards based on oral mucosa and tongue lecture notes.

What type of epithelium lines the oral cavity?

Stratified squamous epithelium

What are the characteristics of lining mucosa?

Soft, moist, stretchy

Where is lining mucosa found?

Lips, cheeks, floor of mouth, ventral tongue, soft palate

What are the characteristics of masticatory mucosa?

Firm, rubbery

Where is masticatory mucosa found?

Hard palate, attached gingiva, dorsal tongue

Where is specialized mucosa found?

Dorsal tongue

What is the main function of keratinocytes?

Produce keratin

How many layers does nonkeratinized epithelium have?

3 layers (basal, intermediate, superficial)

What are the characteristics of orthokeratinized epithelium?

Fully keratinized cells with no nuclei

Where is orthokeratinized epithelium seen?

Masticatory mucosa

What is a characteristic of parakeratinized epithelium?

Superficial cells retain nuclei

Where is parakeratinized epithelium seen?

Attached gingiva and some tongue areas

What is the function of the basal layer?

Mitosis occurs

What is another name for the prickle layer?

Stratum spinosum

What do granular layers contain?

Keratohyaline granules

What happens in the keratin layer?

Keratin squames shed

What are Fordyce spots?

Misplaced sebaceous glands in the oral mucosa

What causes linea alba?

Hyperkeratinized line on buccal mucosa from occlusion

Where is mucoperiosteum seen?

Hard palate and attached gingiva

What are exostoses?

Bony growths usually on facial surface of maxilla

What is ankyloglossia?

Tongue-tie: short lingual frenum limiting movement

What are the two layers of the lamina propria?

Papillary and dense layers

Name the types of lingual papillae.

Filiform, fungiform, foliate, circumvallate

What are the components of a taste bud?

Supporting and taste cells

What type of salivary glands are Von Ebner glands?

Serous salivary glands

What is the purpose of the Von Ebner glands?

Flush taste pores

What causes geographic tongue?

Benign condition with red/white patches due to changing filiform papillae

What causes black hairy tongue?

Lack of shedding of filiform cells buildup of keratin

What is fissured tongue?

Grooves on dorsal tongue: unknown cause but likely genetic

What is the lingual tonsil?

Lymphoid tissue on posterior dorsal tongue

What type of tissue are on either side of the mucogingival junction?

Border between attached gingiva (pink, keratinized) and alveolar mucosa (red, nonkeratinized)

How long does it take for the junctional epithelium to turnover?

4 to 6 days

How long does it take for the hard palate to turnover?

24 days

What structure does the basal layer of oral epithelium produce?

The basal lamina of the basement membrane

How long does a taste bud take to regenerate?

About 10 days

What part of the tongue contains the most taste buds?

Circumvallate papillae

Which oral tissue type has the fastest turnover time?

Junctional epithelium

Which lingual papillae are most common and do NOT contain taste buds?

Filiform

Which structure divides the tongue into anterior 2/3 and posterior 1/3?

Sulcus terminalis