Chapter 23 Oral Mucous Membrane

Question 1

Oral mucousa

Answer 1

Oral mucosa = the lining of the oral cavity
• It runs from the margins of the lips posteriorly to the area of the tonsils
Composed of stratified squamous epithelium and connective tissue with various surface characteristics.

Question 2

Oral mucousa
3 types

Answer 2

1. Keratinized = layer of dead cells no nuclei
2. Parakeratinized = dead and dying cells with
   and without nuclei
3. Nonkeratinized = cells that are alive (have nuck

Question 3

Functions of the mucosa

Answer 3

Functions:
• Protect the oral structures
• Secretes moisture to maintain the surt texture, and keep tissues moist
• Absorbs nutrients

Question 4

3 Categories of the Oral Mucosa:

Answer 4

1.Specialized mucosa: mucosa on the upper suri (top) or dorsum of the tongue.
2.Masticatory mucosa: tissue of the gingiva and palate; undergoes trauma or compression
*during mastication (chewing) (keratinized).
3.Lining mucosa: all other areas of the oral mucos includes: mucosa of the cheeks, lips, soft palate, flo mouth under tongue, alveolar mucosa. (non keratinized)

Question 5

Masticatory Mucosa

Answer 5

• Comprised of the gingiva and hard palate
• During mastication, food is forced off the teeth and onto gingiva around the necks of teeth, could cause trauma.
• this mucosa is firm, thick, immovable
• Keratinized

Question 6

Lining Mucosa
4 different areas of mouth

Answer 6

• Found 4 different areas of mouth;
• 1. labial/buccal (cheek) mucosa; lines cheeks and inside of lips
• 2. Alveolar Mucosa; from attached gingiva to mucobuccal fold
• 3. Soft palate; soft, moveable area
• 4. ventral surface of tongue/floor of mouth

Question 7

Lining mucosa

Answer 7

• Loose, flexible and unattached tissue
• Don’t undergo same trauma as attached gingiva
• Non-keratinized

Question 8

Gingiva
2 regions

Answer 8

• Gingiva is divided into 2 regions:
• A) free gingiva (marginal gingiva)
• B) attached gingiva
• The 2 regions combine to form the peak of gingiva that extends coronally between teeth (interdental papilla)

Question 9

Col

Answer 9

• The col is part of the interdental papilla that is apical to the contact area and connects the facial and lingual interdental papillae.
• The col is nonkeratinized (not attached)

Question 10

Sulcus

Answer 10

• Sulcus: is the space from the gingival margin to the base of the sulcus where it attaches to the tooth
• Average depth of sulcus when measured with a periodontal probe is about 3mm.
• Non-keratinized

Question 11

Gingiva

Answer 11

• At the bottom of the sulcus is where the gingiva attaches to the tooth (free gingival groove)
• Known as attachment epithelium
• This is beginning of keratinized tissue

Question 12

Interdental Papilla

Answer 12

Interdental papilla is to prevent food from impacting interproximally beneath the contact areas of teeth, what could happen if food is left there?
• Its an important part of gingiva
• Healthy state, it fills the area btw teeth up to the contact areas

*****One of the first areas involved in periodontal disease; becomes swollen and blunted

Question 13

Attached gingiva

Answer 13

• Tightly attached to the underlying connective tissue and bone
*****Healthy state, usually has stippled dimpled appearance
• Due to (Sharpys fibers) connective tissu fibers attaching the epithelium to underlying bone
• First sign of periodontal disease is loss o stippling (edema)

Question 14

Mucogingival junction

Answer 14

Mucogingival junction: line between alveolar mucosa and attached gingiva