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
