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Dental Histology - Oral Cavity
Exam 4
38
Medical
Professional
11/27/2008

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Term

Oral Cavity

 

-anatomy 

Definition
Bordered:
Anteriorly = lips
Psoteriorly = oropharynx
 
Lined:
oral mucosa
    -continuous with skin at vermillion border
    -continuous with GI at pharynx 
 
 
Term
Funtions of oral mucosa
Definition
1. Protection
2. Sensation
3. Secretio
4. Thermal Regulation
5. Speech
6. Respiration 
Term
Oral Mucosa - Protection
Definition
-barrier to microorganisms
-withstands mechanical trauma
 
However: some things can penetrate mucosa in areas where epithilium is thinner 
Term
Oral Mucosa - Sensation
Definition

Receptors for:

-taste

-touch

-temperature

-pain

-salivation

-certain neuromuscular reflexes 

Term
Oral Mucosa - Secretion
Definition
-saliva
-sebum (very minor) 
Term
Oral Mucosa - Thermal Regulation
Definition
-insignificant in humans
-heat may be radiated from body via panting
    ex. RUSTY (he smells like angels) 
Term
Oral Mucosa - Speech
Definition
modification of sound
Term
Oral Mucosa - Respiration
Definition
conduit for inhalation and exhalation
Term

Differences Between Oral Mucosa and Integument

 

(5) 

Definition
 Oral Mucosa =
1. more deeply colored
2. has moist surface
3. no skin appendages
        except Fordyce granules (sebaceous glands) 
4. smooth
        except rugae, tongue papilla, linea alba, and                 surface stippling
5. localized variation in firmness and surface texture 
Term

Divisions of oral mucosa within the Oral Cavity

 

(4) 

Definition
1. Masticatory Mucosa
 
2. Lining Mucosa
 
3. Specialized Mucosa
 
4. Mucosal Junctions 
        a. mucocutaneous junction
        b. mucogingival junction
Term

Divisions of oral mucosa within the Oral Cavity

 

Masticatory Mucosa 

Definition
-on gingiva and hard palate
-thick ortho/parakeratinized strat. squam. epith
        over a densly collagenized connective tissue
              -directly adheres to periosteum
                       (mucoperiosteum)
 
     
Term

Divisions of oral mucosa within the Oral Cavity

 

Lining Mucosa 

Definition
-soft palate, ventral surface of tongue, floor of                 mouth, lower part of alveolus, lips, and labial             and buccal mucosa
-thin non-keratinized (lips are ortho/parakeratinized)
      attached to underlying bone or muscle via loose       irregular collagenous connective tissue 
-minor salivary glands, adipose tissue, and Fordyce           granules present in e.g. soft palate, buccal and       labial mucosa 
Term

Divisions of oral mucosa within the Oral Cavity

 

Specialized Mucosa 

Definition
-thick keritinized or nonkeritinized strat. squam. epith
-forms diff tupes of lingual papillae
-connective tissue contains rich nerve and vascular                 supply  
-posterior aspect = minor salivary glands
-specialized for taste 
Term

Divisions of oral mucosa within the Oral Cavity

 

Mucosal Junction

 

A. Mucocutaneous Junction 

Definition
-seperate ciircumoral skin from vermillion zone of lips
-lip epithilium = thin + keritinized + prominante                                 vasularized rete pegs 
                    = red appereance of lips
-lack of skin appendages
      -exception sebaceous glands
 
 
 
Term

Divisions of oral mucosa within the Oral Cavity

 

Mucosal Junction

 

B. Mucogingival Junction 

Definition
-seperates alveolar mucosa from attached gingiva
 
Alveolar Mucosa = nonkeritanized strat. squam. epi
                       = loose lamina propria
                       = high elastic fiber content
 
Attached Gingiva = keritinized strat. squam. epi
                        = lamina propria contains coarse                                 collegen bundles                                                     (attached directly to periosteum)
Term

Tissue components of Oral Cavity

 

(5) 

Definition
1. Oral Mucosa
2. Rete Pegs
3. Lamina Propria
4. Lymphoid Tissue
5. Submucosa 
Term

Tissue components of Oral Cavity

 

Oral Mucosa

 

(superficial -> deepest) 

Definition
1. Startum Corneum
2. Startum Granulosum
3. Stratum Spinosum
4. Startum Basale 
Term

Tissue components of Oral Cavity

 

Oral Mucosa

 

Startum Conreum 

Definition

-outermost

 

-either orthokeratin or parakeratin 

Term

Tissue components of Oral Cavity

 

Oral Mucosa

 

Startum Granulosum

Definition
-thin layer of flattened cells
-contain basophilic keratohyalin granules
 
-nonkeratinized = granular and cornified layers                                     replaced with stratum                                             intermedium and superficial 
Term

Tissue components of Oral Cavity

 

Oral Mucosa

 

Startum Spinosum

Definition
-THICKEST
-cells are polyhedral
-prominent circumferential desmosomal attachments
-contains Langerhans cells 
Term

Tissue components of Oral Cavity

 

Oral Mucosa

 

Startum Basale

Definition
-single layer of cuboidal/columnar cells
-deeply staining nuclei
-mitotically active layer
-gives rise to cells that mature and later exfoliate
-contains melanocytes
-contains Merkel cells 
Term

Tissue components of Oral Cavity

 

Rete Pegs

Definition
-concical projections
-superficial connective tissue
-interdigitate with epithelial ridges
-form attachment interface with high surface area
           = more resistant to shearing forces
-nerves, capillaries, venules, and lympatics
            =used to supply and drain the epithelium
 
Term

Tissue components of Oral Cavity

 

Lamina Propria

 

(2 layers) 

Definition
-zone of connective tissue
-supports epithilium
-seperates epi from submucosa and.or other structures
-rich supply of neural + vascular stuff
 
Consists of 2 Layers 
1. Papillary Layer - found among epithelial ridges
2. Reticular Layer - irregularly oriented collagen bundles (collegen                             more dense than in papillary)
                        - not named for presentce of any reticular                                         connectve tissue
                    NO RETICULAR CONNECTIVE TISSUE 
Term

Tissue components of Oral Cavity

 

Lympoid Tissue

Definition
 
 
normal = scatteres lymphocytes
and plasma cells
throughout the subepithelial
connective tissue
Term

Tissue components of Oral Cavity

 

Submucosa

Definition
-found in lips, cheeks, and portions of palate
-less densly crowded collagen bundles than in lamina                 propria 
-lots of nerve + vascular tissue
-minor salivar glands
-fat 
Term
Keratinocyes
Definition
all cells that eventually form keratin
Term
Nonkeratinocytes
Definition

in oral cavity

 

Langerhans cells, melanocytes, and Merkel cells 

Term
Inflammatory Cells
Definition

migrating leukocytes

 

found within oral surface epi 

Term

Specialized Oral Mucosa: Dorsum of the Tongue

 

(5) 

Definition

1. Terminal Sulcus

 

and the 4 papillae

 

2. Filiform Papillae

3. Fungiform Papillae

4. Foliate Papillae

5. Circumvallate papillae

Term

Specialized Oral Mucosa: Dorsum of the Tongue

 

Terminal Sulcus

Definition

V-shaped groove

 

seperates body of tongue from tongue base 

Term

Specialized Oral Mucosa: Dorsum of the Tongue

 

Filiform Papillae 

Definition
-elongated structure
-anterior portion of tongue (numerous)
-thin connective tissue core
-overlying start. squam. epi
-tall spire of parakeratin
-NO TASTE BUDS associated 
Term

Specialized Oral Mucosa: Dorsum of the Tongue

 

Fungiform Papillae

Definition
-dome or mushroom shaped
-among filiform om anterior tongue
-thin nonkeratinized strat. sqam. epi
-contain surface taste buds
-thick coonective tissue core 
-sweet and salty tastes 
Term

Specialized Oral Mucosa: Dorsum of the Tongue

 

Foliate Papillae

Definition
-posterolateral tongue
-not prominent in humans
-parrallel array of mucosal ridges
-contain taste buds along the ridge inclines (lateral) 
Term

Specialized Oral Mucosa: Dorsum of the Tongue

 

Circumvallate Papillae

Definition
-8-12 large papillae
-anterior aspect of terminal sulcus
-encircled by deep groove
            -minor salivary glands ducts empty into
                    ex. glands of von Ebner
-seperior surface = keratinized strat. squam. epi
-lateral surface = nonkeratinized
                            +  many intersperses taste buds
-acid, sour, bitter taste 
Term
Taste Buds
Definition
-chemoreceptors (modified epithelial cells)
-on tongue, palate, pharynx, and epiglottis
-most numerousl on oral tongue
-encompass thickness of epith
-ovoid shape
-communicate with oral/pharyngeal cavity via small                         circular taste pore 
-3 types of cells
    1. basal cell
    2. gustatory cell
    3. sustentacular (supporting) cell 
Term

Taste Buds

 

the cells 

Definition
1. Basal Cell - precusor cell (regenitive mitotic cell)
2. Gustoatory Cell - light-staining is taste receptor
        (daughter cell)
3. Sustentacular (supporting) cell - dark-stain that             supports gustatory cell and is also taste                 receptor (daughter cell)
 
2+3 have unmyelinated nerve endings and have             apical microvilli that protrude into tase pore
2 has closer relationship with nerve fibers
 
Term
Waldeyer's Ring
Definition
-wide distibution of lymp tissu in oral cavity,                     subepithilial tissue, small nodules in floor of             mouth, ventral tongue, and soft palate
-concentratted in psterior in form of palatine, lingual         and pharyngeal tonsils 
-this forms irregular ring of lymp tissue surrounding             enterence of oropharynx 
Term
Age changes in Oral Mucosa
Definition
1. thinner epithilium
2. flattening of epithelial ridges
3. smoother surface
4. decreased number of filiform papillae
5. decreased number of Langerhans cells
6. vascular changes - lingual varices
7. increased number of Fordyce granules
8. decreased cellularity/increased collagen content of lamina propri
9. salivary gland atrophy - leads to alterations in taste, dryness of                            the mouth (xerostomia) and burning sensation 
10. loss of definition of the vermillion border
                (mucocutaneous junction) (lip border not as defined)
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