Histology of the Nasal & Oral Cavities Flashcards
Which glands produce the most saliva
Submandibular produce 60-70%- both serous and mucus
Parotid about 30%- only serous secretion
Submandibular 3-5%- serous and mucus
Type of joint in teeth
Gomphosis
Levator veli palatini/tensor veli palatini function
Innervated by CN V3
Tensor-Tenses soft palate, and acts on eustachian tube to depressurize middle ear
Levator- elevates soft palate, and acts on eustachian tube to depressurize middle ear
Paralysis of either/both can lead to reflux into nasal cavity and ETD
Characteristics of respiratory epithelium
Pseudostratified columnar ciliated
Goblet cells
Lamina propria has rich vascular network with complex capillary loops
Paranasal sinuses are lined with what epithelium
Respiratory
Nasal vestibule epithelium
Keratinized stratified squamous
Hallmark of olfactory mucosa
Located in apex of nasal cavity Dramatically thicker Lacks goblet cells Still pseudostratified ciliated columnar Olfactory glands have serous secretions that dissolve odorant molecules
CT of mucosa contains
Fibroblasts, WBCs, collagen
Papillary layer (of lamina propria?)
Superficial, loose CT with neurovasculature
Dense layer (of lamina propria?)
Deep, dense irregular CT with large amounts of vibers
Submucosal layer (of lamina propria?)
May be present depending on location
Loose CT, adipose tissue & salivary glands
Masticatory mucosa
Found on hard palate, gingiva and dorsal tongue
Keratinized/parakeratinized stratified squamous
Superficial cells do not lose nuclei and cytoplasm does not stain well
Nuclei are highly condensed and remain until cell is lost
Thin or absent submucosa
Lining mucosa
Found on lips, cheeks, alveolar mucosal surface, floor of mouth, inferior tongue and soft palate
Non-keratinized stratified squamous, but may be parakeratinized in selected locations
Thicker than keratinized epithelium and has:
Stratum basale, spinosum and superficiale
Lingual papillae
Keratinized epithelium w/lamina propria
Small, elevated structures, some of which are associated with taste buds
Filiform papillae
Move food toward pharynx for swallowing
Give dorsal tongue velvety texture
No taste buds
Foliate papillae
Vertical ridges on lateral surface of tongue in more posterior region
Provide taste sensation
Fungiform papilla
Dorsal surface of tongue, found in lesser numbers
Provide taste sensation
Circumvallate papillae
7-15 mushroom shaped structures anterior to sulcus terminalis
Sunken appearance, surrounded by trench
Hundreds of taste buds present
Taste buds
Each taste bud can discern all five tastes but most focus on a specific two
Neuroepithelial sensory cells
Elongated cells extend from the basal lamina of the epithelium to the taste pore
Extend a microvilli through the pore
Synapse with afferent sensory neurons of CN VII, IX or X
Supporting cells
Elongated cells extending from basal lamina to taste pore
Contain microvilli on apical surface, do not synapse with nerve cells
Basal cells
Provide stem cells for neuroepithelial cells and supporting cells
Palatine tonsil tissue type
Nonkeratinized stratified squamous
Pharyngeal tonsil
Pseudostratified columnar ciliated epithelium
Posterior wall of nasopharynx
Lingual tonsil
Base of tongue
Stratified squamous epithelium
Germinal centers
NO capsule, unlike the others
Pulp
Loose, mesenchymal CT
Collagen fibers, fibroblasts, mesenchymal stem cells
Highly vascular and well innervated
Provides nutrition to dentin, can form reactive dentin due to chronic injury
