Histology Of Oral And Nasal Cavities Flashcards
Respiratory mucosa is lined by ____. Cells rest on a basement membrane, have a lamina propria rich in ___, serous and mucous glands, and mucous propelled by _____, goblet cells, and lymphocytes.
Regenerated by stem cells
Pseudostratified communal ciliated epithelium
BV
Cilia
Nasal cavity is lined by ____ that adjusts the temperature and humidity of inspired air.
Respiratory mucosa
Olfactory mucosa contains ____ for sense of smell. This mucosa has pseudostratified epithelium with basal stem cells in basement membrane, columnar support cells, _____, and specialized olfactory glands (Bowman’s glands).
Dendrites of olfactory neurons have ____.
Bipolar olfactory neurons
Olfactory hairs: nonmotile cilia with specialized membrane receptors for odorant molecules -> signals sent to olfactory bulb
Olfactory epithelium is thicker and it lacks ____.
Olfactory glands called ___ produce ____.
Goblet cells
Bowman’s glands: serous secretions that dissolve odorant molecules to facilitate detection
Oral cavity is lined by _____ called _____.
What are the three types of mucosa?
Protective mucous membrane of stratified squamous; oral mucosa
Lining, masticatory, specialized mucosa
The oral cavity mucosa is supported by dense collagenous tissue called ____.
This contains fibroblasts, WBC, collagen fibers.
Two layers called ____ and ____ that contain what?
Some areas have a ______ layer.
Lamina propria
Papillary: loose CT, with neurovasculature
Dense: deep, dense irregular CT with fibers
Submucosal layer: CT, adipose, salivary glands
Three layers of nonkeratinized stratified squamous epithelium deep to superficial?
Basal: deepest single layer with cuboidal cells, mitosis
Intermediate: thick, no mitosis
Superficial: thick with outer cells flattened into squames
Four layers of keratinized stratified squamous epithelium deep to superficial?
Basal: single layer with mitosis
Prickle cell: thick, no mitosis
Granular: flat, stacked with keratohyaline granules
Keratin: flat cells lacking nuclei, full of keratin
Lining mucosa is _____ epithelium with few rete ridges and CT papillae and underlying submucosa.
This mucosa is soft, moist, can stretch/compress. Where is it located?
Nonkeratinized stratified squamous
Buccal, labia, alveolar mucosa, mucosal lining of floor of mouth, central surface of tongue and soft palate
Masticatory mucosa is _____ epithelium. It is rubbery with good resiliency, is interdigitated with rete ridges and papillae, thin or absent submucosa.
Where is it located?
Keratinized stratified squamous
Hard palate, gingiva, dorsal surface of tongue
Where is the specialized mucosa located?
It contains ____ epithelium.
Dorsal and lateral surfaces of tongue in the form of lingual papillae
Discrete structures composed of keratinized epithelium and lamina propria
The tongue is a mass of striated _____ covered by oral mucosa including ____ and ____ mucosa covered by ____ epithelium.
Skeletal m
Masticatory and specialized mucosa (lingual papilla)
Keratinized stratified squamous
Lingual papilla are elevated structures of ____ covered by ____ epithelium with lamina propria. Some are associated with taste buds.
Specialized mucosa
Keratinized
Taste buds are found in lingual papillae. They have what two types of cells? Fx?
Taste cells: contain taste receptors that make contact with food molecules via the taste pore
Supporting cells: support bud, surround taste cells on outer part of bud
What is the location and fx of foliate and filiform papillae?
Foliate: vertical ridges on lateral surface of posterior tongue; provide taste sensation; contains taste buds
Filiform: move food toward pharynx for swallowing
What is the location and fx of fungiform and circumvallate papillae?
Fungiform: dorsal surface of tongue; provide taste sensation
Circumvallate: anterior to sulcus terminalis; hundreds of taste buds
Tonsils in the mouth are aggregates of lymphatic nodules organized into _____.
The palatine tonsil is located _____ covered by stratified squamous containing lymphocytes with deep invaginations called ____.
Dense CT acts as a _____ with germinal centers.
Waldeyer’s ring
Bilaterally in the oropharynx
Tonsillar crypts
Partial capsule
Pharyngeal tonsil is located ____ covered with _____ epithelium. It contains a ____ and invaginated mucosa with _____.
Along the posterior wall of nasopharynx
Pseudostratified columnar ciliated epithelium
Thin capsule; shallow infoldings, no crypts
The lingual tonsil is located ____ and covered with ____ epithelium. Also contains _____ with crypts but no capsule.
Along the base of tongue
Stratified squamous
Germinal centers
Bulk of the tooth (root and crown) is made up of ___.
What is the fx?
Crown projects into the oral cavity and protected by ____.
Root is embedded in alveolar ridge of an ____.
Root of tooth is invested by a layer of _____.
Dentin: encloses a central pulp cavity/chamber
Enamel
Alveolus
Cementum
Dentin contains ____ crystals.
_____ are parallel tubes that radiate to the periphery of dentin.
Calcium hydroxyapatite
Dentinal tubules
Enamel is composed of _____ and _____. Rods are cemented together by interprismatic material.
Rods and calcium hydroxyapatite
Cementum contains calcium hydroxyapatite and is anchored to the ____. It covers the dentin in the root.
Pulp contains loose mesenchymal CT, collagen fibers, fibroblasts, and mesenchymal stem cells; it is vascularized, innervated. Pulp provides nutrition to ____.
Periodontal L
Dentin
Odontoblasts secrete ____ that mineralizes to dentin. These cells extend into an odontoblast process surrounding a new matrix and becoming entrapped in ____.
Ameloblasts are polarized cells in contact with dentin. They secrete a matrix from Tome’s process that mineralizes to ___. They are lost during tooth eruption.
Cementoblasts secrete cementoid that mineralizes to ____. Cells become trapped forming _____.
Predentin
Dentinal tubules
Enamel
Cementum
Cementocytes
Periodontium contains cementum, periodontal L, alveolar bone and gingiva. The ____ inserts into the cementum and alveolar bone that lines the alveolus.
Periodontal L
