"Dermis/Lamina Propria" layers of Masticatory Mucosa
-Papillary Layer -Reticular Layer
-"keratin layer", thin, flattened, dehydrated cells, no nuclei, soft keratin feeling, fingernail feeling, nonliving material, impervious to bacteria (prevents bacteria from getting into between layers.)
a lot of granulum cells that contain keratohyline, 3-5 cells thick, stain dark, granulum layer.
larger, oval cells, slightly flattened, lost ability to undergo mitosis.
single layer, cuboidal deepest, superior to basil lamina.
Prickle Cell layer
appears on Stratum Intermedium/Spinosum layer of Masticatory mucosa.
-Keratinized (thick) epithelial tissues, firmer, more use to attrition.
A prickly or spiky look results when the individual dehydrated epithelial cells are still joined at their outer layers.
Form a chemical precursor for the keratin found in the more superficial layers.
A soft, opaque, waterproof material formed from a complex of keratohyaline granules & intermediate filaments from the cells.
The main difference between orthokeratinized & parakeratinized is..
in the cells of the keratin layer.
The most superficial layer is still being used or lost, these cells of the keratin layer contain not only keratin but also nuclei, unlike orthokeratinized.
-Located in the superficial layers of lining mucosa. -The lining mucosal tissues have similar epithelial histological traits even though they have some regional differences. -Most common form of epithelium in the oral cavity
-Associated with the hard palate & attached gingiva. -Also associated with the specialized mucosa of the lingual papillae on the dorsal surface of the tongue. -Least common form of epithelium
-Associated with attached gingiva & the tongue's dorsal surface. -Also associated with the specialized mucosa of the lingual papillae on the dorsal surface of the tongue. -Immature form of Orthokeratinized -Same layers as Ortho. -Cells of the keratin layer contain keratin & nuclei
-Nonkeratinized epithelium may transform into a keratinizing form in response to frictional or chemical trauma. -Can result if enough trauma from biting cheek occurs or from people who smoke.
-The most common cell in the lamina propria. -Makes collagen
Other cells present in the lamina propria..
White blood cells, such as PMNS, mast cells, macrophages, & lymphocytes
-Made up of connective tissue -Main fiber: Collagen -Elastic Fibers
Layers of Lamina Propria
-Papillary layer -Dense layer (Reticular layer)
Papillary Layer of Lamina Propria
-Puts finger-like projections into epithelial. -Consists of loose connective tissue, blood vessels, & nerve tissue.
-Barrel-shaped organs of taste from epithelium -30-80 spindle shaped cells -Renewal rate: approximately 10 days -4 taste sensations
Cells of Taste Buds
-Supporting Cells -Taste Cells
Regions located in the Oral Cavity
Lining mucosa, labial mucosa, buccal mucosa, alveolar mucosa, floor of the mouth, ventral surface, soft palate & the masticatory mucosa, attached gingiva, & hard palate
Clinically little depressions which give the surface of the attached gingiva an orange-peel appearance.
Located between the pinker attached gingiva & the redder alveolar mucosa.
Loose connective tissue acting as a periosteum to the underlying bone.
Performed to reduce the amount of gingival recession on the root, which is when keratinization is taken into consideration.
-Discrete structures or appendages of keratinized epithelium & lamina propria. -Found on the dorsal tongue surface
4 types of Lingual Papillae
Filiform, Fungiform, Foliate, & Circumvallate
The 3 types of Lingual Papillae associated with taste buds
Dissolved molecules of food contact the taste receptors at the taste pore. Sensory neuron processes receive messages of taste sensation by way of receptors. The nerve is then sent to the CNS where it is identified as a certain type of taste.
von Ebner's Salivary Glands
Have ducts that open into the trough, flushing the area near the taste pores to introduce new taste sensations from several sequential food molecules. They are located in the submucosa deep to the lamina propria of the circumvallate lingual papillae.
Occupy a position in the basal layer of the Stratified Squamous Epithelium between the dividing epithelial cells.
Turnover time for the Oral Mucosa
is higher than for the skin.
Attaches to the tooth, has the highest turnover time, 4-6 days of all the oral tissues.
has the lowest turnover time, 24 days.
-the immature connective tissue formed during initial repair. -replaced by scar tissue -white-ish, not as pink
The oral mucosa shows ____ scar tissue than skin..
Less. Either clinically or histologically after repair than does the skin because fewer fibers are located in this area than in the skin when it undergoes a similar injury.
Renewal rate of Oral Mucosa
Higher than for skin.
Aging of Oral Mucosa
-Similar to other mucosal tissues of body -Taste buds reduced -Thickness & number of rete ridges diminish
Aging of Oral Cavity
-Reduction of stippling -Increase in Fordyce's granules -Enlargement in lingual veins
Renewal Rate for Hard Palate
Renewal Rate for the Floor of the Mouth
Renewal Rate for Buccal & Labial Mucosa
Renewal Rate for Attached Gingiva
Renewal Rate for Taste Buds
Renewal Rate for Junctional Epithelium (attached to tooth)