11.0 Histology of the Nasal and Oral Cavities Flashcards
What are the hallmarks of respiratory epithelium?
Pseudostratified ciliated columnar
Lots of cilia and goblet cells
Thick basement membrane
What are the 3 main regions of the nasal cavities?
Nasal vestibule (just inside nostrils) Respiratory region (inferior 2/3) Olfactory region (superior 1/3)
What is the difference between the epithelium found in the nasal vestibule vs the respiratory region?
The nasal vestibule contains keratinized stratified squamous epithelium, similar to the skin.
The respiratory region contains peseudostratified columnar ciliated epithelium.
What are the hallmarks of olfactory mucosa?
Pseudostratified ciliated columnar
Dramatically thicker than respiratory epithelium
Lacks goblet cells (has olfactory glands instead)
Thin basement membrane
What are the 3 types of oral mucosa?
Masticatory mucosa
Lining mucosa
Specialized mucosa
What layer of the lamina propria contains the neurovasculature?
The papillary (superficial) layer
What are the ridges between the papillary and dense layer of the lamina propria called?
Rete ridges
What distinguishes masticatory mucosa from the other types of oral mucosa?
It contains keratinized and/or parakeratinized stratified squamous epithelium. Thin or absent submucosa. Usually connected to bone (hard palate).
What distinguishes lining mucosa from the other types of oral mucosa?
It contains nonkeratinized stratified squamous epithelium, but may be parakeratinized.
Consists of 3 layers: Stratum basale, stratum spinosum, and stratum superficiale
What are the histological characteristics of filiform papillae?
Assists in moving food toward pharynx. Shaped like pointed cones. Does not contain taste buds.
What are the histological characteristics of foliate papillae?
Form vertical ridges on posterior lateral surface of tongue. Contains taste buds.
What are the histological characteristics of fungiform papillae?
Found on dorsal surface of tongue. Looks like a mushroom. Contains taste buds.
What are the histological characteristics of circumvallate papillae?
Largest of the lingual papillae. V shaped and surrounded by trench full of taste buds.
What are the histological characteristics of the palatine tonsil?
Possess 10-20 deep invaginations, or tonsillar crypts. Contains capsule of dense connective tissue.
What are the histological characteristics of the pharyngeal tonsil?
Lacks crypts, but has some shallow infoldings. Contains thin capsule.
