taste and olfaction histo Flashcards
how do sinuses communicate with nasal cavities
narrow openings into respiratory mucosa
what is the hallmark of olfactory mucosa
- very thick
- lacks goblet cells
what kind of epithelium is olfactory muscoa
pseudostratified ciliated columnar epithelium
what kind of epithelium is the oral mucosa
stratified squamous w/ varying levels of keratinization
what are the three divisions of oral mucosa
lining
masticatory
specialized
where is masticatory mucosa found
- hard palate
- gingiva
- dorsal tongue
what are the characteristics of masticatory mucosa
- keratinized/parakeratinized
- condensed nuclei
- interdigitated w/ rete ridges and papillae
- thin/absent submucosa
what are the characteristics of lining mucosa
- distinct submucosa
- mostly nonkeratinized
- has stratum basale/spinosum/superficiale
where is lining mucosa found
lips cheeks floor of mouth inferior tongue soft palate
where is specialized mucosa found
only on the dorsal tongue
what are the characteristics of specialized mucosa
- papillae and taste buds
- keratinized epithelium
what kind of papilla of the tongue does NOT provide taste sensation
filiform
what do filiform papillae do
move food toward the pharynx
where are foliate papillae
lateral and posterior surface of the tongue
where are fungiform papillae
small in number on the dorsal surface of the tongue
where are cirvumvallate papillae
anterior to sulcus terminalis
how do taste buds appear when stained
oval, pale extending entire thickness of epithelium
what three cell types make up the taste buds
neuroepithelial cells
supporting cells
basal cells
which cell of the taste bud synapses with afferents sensory neurons
neuroepithelial cells
what is dentin
a calcified organic matrix similar to bone that constitutes the root and crown of teeth
what is cementum
amorphous calcified tissue investing the root of the tooth
what is the function of pulp within teeth
nutrition to dentin
what is predentin
a collagen rich matrix secreted by odontoblasts, mineralizes into dentin after 1 day
what are ameloblasts
tall polarized cells in contact w/ dentin
secretes enamel matrix from Tome’s process
where does the periodontal ligament insert
cementum and alveolar bone
where is olfactory mucosa found
the superior-most portion of the nasal cavity, nearest the ethmoid bone
