Term
| Where do you find masticatory mucosa? |
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Definition
gingivae and hard palate
Lacks submucosa on gingival and palatine raphe, but found on the hard palate
Hard palate: anterior adipose CT
posterior mucos glands
collagen fibers anchor mucosa to periosteum |
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Term
| where is the most common places of cancer in the oral cavity? |
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Definition
1. floor of mouth
2. ventral surface of tongue
3. Soft Palate
4. Dorsal surface of posterior of tongue
2 most common causes: alcohol and tabacco |
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Term
| where do you find the "lining mucosa" of the oral cavitity? |
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Definition
most of oral cavity
nonkeratinized stratifed (some parakeratinized like that of masticatory mucosa)
contains 3 layers: stratum basale
stratum spinosum
stratum superficiale
the submucos is present except on the inferior surface of tongue |
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Term
what papillae are the smallest and most numerous,
keratinized stratified squamous epithelium (rough),
and are the only papillae that lack taste buds? |
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Definition
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Term
| What is mushroom-shaped and abundant at the tip of the tongue? |
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Definition
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Term
| Describe Circumvallate papillae |
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Definition
8-12 surrounded by a moat located anterior to sulcus terminales,
contain Von Ebner's glands that empty serous secretions to absorb the Next item |
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Term
| what papillae are covered by stratified squamous epithelium located along the lateral sides of tongue, also have small serous glands that empty into clefts (von ebners glands)? |
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Definition
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Term
| what three cell types make up a taste bud? |
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Definition
Neuroepithelial cells: Tastants bind to TR1 and TR2 associated with G protein complex call gustducin. GTP depolarizes and influx of Ca ions cause release of neurotransmitters, CN 7, 9, 10
Supporting Cells: microvilli and tight junctions but do not synapes
Basal cells: serve as stem cells |
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Term
| what salviary gland contain coumpound acinar glands and are purely serous? |
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Definition
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Term
| what gland is compound tubul-acinar, mixed but serous dominates and has serous demiluens? |
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Definition
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Term
| compound tubulo-acinar gland, mixed but majority is mucous, serous demilunes present |
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Definition
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Term
| how many teeth are located in one quadrant? |
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Definition
8
16 maxillary and 16 mandibular |
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Term
| Name the three layers of a tooth |
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Definition
enamel: covers anatomic crown; absent at root
Dentin: when exposed it's yellow
Cementum: covers root;absent at anatomic crown |
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Term
| What are the two protein components of enamal? |
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Definition
Enamelins and tuftelins: mature enamal contains 96-98% calcium hdroxyapatite
enamal rods span entire thicknes of enamal layer
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Term
| where is the enamel organ derived from? |
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Definition
| the ectodermal epithelial cells of the oral cavity: ameloblasts of the organ produce enamel. |
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Term
| what stage involves the invagination of oral epithelium induced by neuroectodermal cells, and contain growth factor 4 and proteins 2, 4,7? |
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Definition
Bud stage (20 buds formed)
primordium of enamel lies within th invagination |
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Term
| What stage involves the differentiation of cells into ameloblasts from the inner enamel epithelium, and the differentiation of dental papilla into odontoblast that form dentin and is induced by activin Beta A and bone? |
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Definition
Cape stage
activin induces early cap stage |
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Term
| what four layers are formed in the bell stage? |
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Definition
outer enamel
inner enamel
stratum intermedium: elaborate and transport substances to ameloblasts
Stellate Reticulum: connected by desmosomes in the ECM of GAGS and H20 |
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Term
Amelogenesis:
matrix production:
matrix maturation |
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Definition
matrix production: partially mineralized enamel is elaborated directly on pfreviously formed dentin called Tome's Process
Matrix maturation: removal of the organic components, ameloblasts posses ruffled or striated borders, statum intermediate layer is absent instead papillary layer is found
ameloblast degenerate following enamel maturation which occures around tooth eruption through the gingiva (gum) |
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Term
is cementum vascular or avascular?
what type of fibers are the principle component of the periodontal ligament? |
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Definition
avascualr
Sharpey's fibers
ementoblasts secrete cementum-->when surrounded by cementum they become cementocytes in a lacunae |
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Term
| is cementum or dentin sensitive to pain and temp? |
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Definition
Dentin: 70% inorganic,
it is secreted by odontoblasts
derived from neural crest cells
odontoblasts first secret predentin which is unmineralized
form growth lines: good for forensic medicine |
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Term
| what part of the tooth is well endowed with blood vessels and nerves and becomes smaller with age as more dentin is secreted? |
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Definition
| Dental pulp and pulp cavity |
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