Histology of Taste and Olfaction Flashcards
What is the type of epithelium for the respiratory system?
What other cells does it possess?
Pseudostratified columnar ciliated epithelium.
Includes goblet cells and basal stem cells.
What layer provides the blood supply to respiratory epithelium?
Lamina propria
Nasal vestibule
Respiratory region
Olfactory region
Nasal vestibule: just inside the nostrils, lined by skin.
Respiratory region: inferior 2/3 of nasal cavities, lined w/ respiratory mucosa.
Olfactory region: located at apex (upper 1/3), lined by olfactory mucosa.
Epithelium of nasal vestibule
Keratinized stratified squamous. It is skin.
Olfactory mucosa epithelium:
Hallmarks (2):
What glands does it have?
Psuedostratified columnar epithelium.
Much thinner than respiratory epithelium. No goblet cells.
Olfactory glands
Olfactory receptor cells
Specialized, nonmotile cilia w/ odorant receptors.
Have a single dendritic process.
Basal cells of olfactory mucosa
Stem cells for olfactory receptor and supporting cells.
Brush cells of olfactory mucosa epithlium:
What CN does it contact?
Ciliated columnar epithelium.
Contacts CN V.
Supporting/sustentacular cells of olfactory mucosa function:
Provides mechanical and metabolic support the the olfactory receptor cells.
Epithelium of oral cavity
What is the epithelium divided into? (3)
Stratified squamous type w/ varying keratinization and specialized mucosa.
Lining, masticatory and specialized mucosa.
Papillary and dense layers of lamina propria
Papillary: superficial, loose CT w/ neurovasculature.
Dense: deep, dense CT w/ lots of fibers.
Where is masticatory mucosa found?
What is the epithelium?
Hard palate, gingiva and dorsal surface of tongue.
Keratinized and/or parakeratinized startified squamous epithelium.
Where is lining mucosa?
What is the epithelium? What are the layers of it?
Lips, cheeks, alveolar mucosa, floor of the mouth, inferior surface of tongue and soft palate.
Nonkertanized SS epithelium.
- stratum basale: on lamina propria.
- stratum spinosum: several layers thick.
- stratum superficiale: superficial layers.
Where is the specialized mucosa?
What does it contain? (2)
Only on dorsal tongue.
Papillae and taste buds.
Tongue is composed of which mucosas? (2)
What epithelium covers the muscular surface of the tongue?
Masticatory and specialized mucosa.
Keratinized SS epithelium.
Lingual papilla
Small elevated structures of mucosa that are associated w/ taste buds.
Filiform papillae
Foliate and fungiform papillae
Circumvallate papillae
Move food toward pharynx. Velvety texture of tongue. No taste buds.
Involved in taste sensation.
Hundreds of taste buds.
What shape are taste buds?
Barrel-shaped
Neuroepithelium (sensory) cells of taste buds
What do they synapse with? (3)
Elongated cells from basal lamina that extend into taste pore.
CN VII, IX or X.
Support cells of taste buds:
Basal cells of taste buds:
Cells from basal lamina to taste pore and do NOT synapse
Small cells on basal taste bud. Stem cells.
Taste sensations and their location on tongue (w/ one excpetion) (5)
Sweet: tip of tongue.
Salt: anterior and lateral tip of tongue.
Sour: lateral margin of tongue.
Bitter: posterior tongue.
Umami (savory): taste of monosodium glutamate.
Can taste buds register all 5 senses?
Where can we register all 5 senses?
Only 2/5.
Posterior pharynx and epiglottis.
What is dentin made of?
What is dentinal tubules?
Ca++ hydroxyapatite.
Dentinal tubules radiate to periphery of dentin.
What is enamel made of?
What holds it together?
Enamel rods of Ca++ hydroxyapaptite.
Held together by interprismatic material.
Ameloblasts make:
Odontoblasts make:
Enamel
Dentin
