Oral Mucosa - Wright Flashcards
Keratinized Oral epithelium:
location:
found in masticatory mucosa. (anterior portion of hard palate).
Keratinized oral epithelium:
surface from outer to inner
surface cells are keratinized (cornified)
stratum basale - cells cuboidal with central nuclei
stratum spinosum - cells look like ones in skin, lots of desmosomes, polyhedral.
stratum granulosum - cells begin to flatten, contain basophilic KERATOHYALIN GRANULES
stratum corneum: flattened cells called squames for this layer.
no nuclei in epithelium
orthokeratinization:
process by which cells in stratified squamous stratum corneum develop
Parakeratinized oral epithelium:
found in parts of gingiva and hard palate.
keratohyalin granules might be present, but stratum granulosum is less obvious than keratinized epithelium.
note: u shud never see parakeratinization in skin.
nonkeratinized oral epithelium:
location
majority of oral cavity.
found in lining mucosa. found inside of cheeks, inside of lips, on soft palate, under surface of tongue.
nonkeratinized oral epithelium:
difference:
no stratum granulosum. There is stratum intermedium instead.
no stratum corneum, there is stratum superficiale instead.
Difference between keratinized and nonkeratinized stratified squamous cells:
Keratinized: tonofilaments bundled together to form tonofibrils
Nonkeratinized: tonofilaments remained dispersed and un-bundled.
organelle: Membrane-coating (lamellate) granule appears in upper stratum spinosum.
keratinocyte:
primary cell type in t he stratified squamous epithelium
non-keratinocytes:
melanocytes
langerhans cells
merkel cells
inflammatory cells
layers of the lamina propria
papillary layer
reticular layer
Types of Oral mucosa:
Masticatory Mucosa
location
covers areas of oral cavity subjected to compressive / shear forces and abrasion during mastication
base of teeth, around teeth, attached gingiva, roof of mouth (palate).
found in hard palate and gingiva.
Types of Oral mucosa:
Masticatory Mucosa
facts
epithelium thick / orthokeratinized (sometimes parakeratinized)
numerous tall papillae of lamina propria increase surface area for attachment of epithelium.
collagen tightly anchored to underlying periosteum, forming mucoperiosteum
rigid, inflexible.
Types of Oral mucosa:
Lining mucosa:
location
underside of tongue, inside lips, cheeks, floor of mouth, alveolar processes up to gingiva, soft palate
Types of Oral mucosa:
Lining mucosa:
facts
epithelium thicker than masticatory mucosa, but nonkeratinized
more flexible, able to withstand stretching. can pull cheek and stuff
lamina propria thicker, less lamina propria, less papillae, typically thick submucosa
Types of Oral mucosa:
Specialized mucosa:
Location:
Covers dorsum (upper surface) of tongue
Types of Oral mucosa:
Specialized mucosa:
facts:
similar to masticatory mucosa, but with special features
anterior 2/3 of tongue = first arch. posterior 1/3 = 3rd arch. region separated V-shaped groove, sulcus terminalis
special features of specialized mucosa:
types of lingual papillae:
types of lingual papillae:
fungiform papillae (mushroom-shaped)
filiform papillae: most numerous. thread-shaped.
foliate papillae: leaf-shaped
circumvallate papillae: surrounded by wall. each surrounded by deep circular groove into which von Ebner’s glands drain. just anterior to sulcus terminalis
Mucosal junctions:
Mucocutaneous junction:
junction between skin / oral mucosa at LIPS
red/vermilion zone: has thin keratinized epithelium with high CT papillae bringing capillaries close to surface. Gives the red coloration
Mucosal junctions:
Mucogingival junction:
junction between attached gingiva and alveolar mucosa.
free gingival groove: marking boundary between attached and free gingiva, corresponding to bottom of gingival sulcus, where teeth attaches to gingiva
Mucosal junctions:
Dentogingival junction:
attachment of oral mucosa to the tooth
Sulcular epithelium: lines free gingiva
Junctional epithelium: where gingiva attaches to tooth
Reduced enamel epithelium derives into this
Attaches to teeth and underlying connective tissue by basal lamina
Lamin propria for sulcular epithlium is more mature than lamina propria than junctional epithelium
Col is where we floss (interdental gingiva)
