Lecture 11: Histology of Nasal and Oral Cavities Flashcards
What are the hallmarks of respiratory epithelium?
- Ciliated
- Thick basement membrane
- Many goblet cells
Pseudostratified Columnar Ciliated Epithelium
What are three regions of the nasal cavities?
Nasal Vesituble: Nostril area
Respiratory Region: Inferior ⅔
Olfactory Region: Superior ⅓
What type of epithelium lines the nasal vestibule?
Keratinized stratified squamous epithelium
What are paranasal sinuses?
What is their clinical significance?
- Extensions of respiratory region of the nasal cavity
- Communicates with nasal cavities via narrow openings
- Subject to infections (URI)
What are the hallmarks of olfactory mucosa?
- Lacks Goblet Cells
- Dramatically thicker than respiratory epithelium
- Still pseudostratified ciliated columnar
- Thin Basement Membrane
What is the function of the olfactory glands?
Serous secretions that dissolve odorant molecules
Make up for lack of mucus from goblet cells
What cells have specialized, nonmotile cilia with odorant receptors?
Olfactory Receptor Cells
What type of epithelium is found in the oral cavity?
What are the three classifications of this epithelium?
Protective Mucous Membrane: Oral Mucosa
-
Stratified Squamous (w/ varying keratinization)
- Masticatory
- Lining
- Specialized Mucosa
What layer of mucosa in the oral cavity contains the neurovasculature?
Papillary Layer of Lamina Propria
If the submucosal layer is present in the oral cavity, what does it contain?
Loose CT
Adipose Tissue
Salivary glands
What epithelium makes up the masticatory mucosa?
Keratinized and/or parakeratinized stratified squamous epithelium
- Nuclei highly condensed
- Thin/absent submucosal layer*
Where can you find masticatory mucosa?
Hard palate
Gingiva
Dorsal surface of the tongue
What is the purpose of rete ridges and papillae in masticatory mucosa?
Allows mucosa to stay firmly adhered to connective tissue beneath it
Where is lining mucosa found?
- Lips
- Cheeks
- Alveolar mucosal surface: where teeth are fixed
- Floor of mouth
- Inferior surfaces of the tongue
- Soft palate
What type of oral mucosa would have a distinct submucosa?
Lining mucosa
What type of epithelium makes up lining mucosa?
Nonkeratinized stratified squamous, may be parakeratinized in some sections
Quite Thick
What are the 3 layers of the epithelium of lining mucosa?
- Stratum basale: single layer and regenerates cells
- Stratum spinosum: thick layer
- Stratum superficiale: surface cells