pakc Flashcards
What are the three regions of the lip?
The exterior aspect, the vermilion, and the internal (mucosa) aspect.
What type of epithelium covers the three aspects/regions of the lips?
Stratified squamous epithelium
Where can kertinized simple squamos epithelium be found in the oral cavity?
Gingiva (gums), Hard palata.
What is special about the lamina propria in the kertinized regions in the oral cavity?
LM rests directly on the bone in these regions
Where can Non-kertinized simple squamos epithelium be found in the oral cavity?
Soft palate, cheeks, floor
What type of lymphoid tissue does the oral cavity have?
Diffuse lymphoid tissue
What are the features of the filiform papillae?
Smallest, Pointing backwards, long.
No tastebuds
Increase friction between food and tongue
Keratinized (Remember Cat)
What are the features of the fungiform papillae? Why do they look red?
Have a few taste buds
Scattered around but not numerous
Look like fungi/mushrooms
Look red because of thin epithelium and rich blood vessels
Where on the tongue can fungiform papiliae be found?
On the margin of the tongue
What are the features of the Circumvallate papillae?
8-12
Largest
Dome shaped
Have numerous taste buds
Have invagnation around them
Associated with Ebner’s glands which drain into the invagination
What are the charactersitcs of Foliate papillae?
Not abundant in human
Parallel low ridges separated by deep mucosal clefts
On the lateral edge of the tongue
Contain taste buds
What are taste buds? Where are they found?
Oval, pale staining sensory receptors that extend over the thickness of the epithelium.
Contain taste pores, which are small openings at the apex of the taste bud
Found:
Fungiform
Circumvalate
Foliate
Epigoltiss
Palate
What are the charactersitcs of neuroepithelial taste bud cells?
Most numeros
Oval shaped
Microvilli protrude through the taste pore (to pull chemicals in)
Apical tight junctions connect them to neighbouring cells
Basaly synapse with cranial nerves (VII, IX, X)
What are the charactersitcs of Supporting and basal taste bud cells?
**Supporting cells: **
Less numerous
Possess microvilli
Basal cells: stem cells
What penetrates the lingual tonsils?
Crypts
What is the difference between minor and major salivary glands?
Major Has capsule
Minor: Doesn’t have capsule
What are the major glands?
Minor?
Major: Parotid
Submandibular
Sublingual
Minor: Lingual
Palatine
Buccual
Molar
What are the functions of saliva?
Lubricates the oral cavity (mucus and water)
Antibacterial:
Lysozyme, which attacks the walls of bacteria
Lactoferrin, which chelates iron necessary for bacterial growth
SIgA, which neutralizes bacteria and viruses
Digestive function
Amylase (ptyalin), which initiates the digestion of carbohydrates (starch) in the oral cavity
Lingual lipase, which participates in the hydrolysis of dietary lipid
What are the basic features of the salivary glands?
Acini and excretory ducts
What are the acini surrounded by?
Capsule
What are the types of acini?
What are they surronded by?
Serous acini
Mucous acini
Mixed sero-mucinous acini
Surrounded by myoepithelial cells
What are the features of Serous acini?
Spherical
Serous cells have a pyrimadil shape
Stain darkly
Have prominent Golgi and basal RER
Apical ends filled with secretory granules
What are the features of Mucous acini? In what form is the mucous stored?
Lightly stained
Looks like pizza
Mucus is synthesized and stored within the cell apex as mucinogen granules
Why do serous cells appear purple in H&E?
Bc they contain serous demilunes
