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31 Cards in this Set
- Front
- Back
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How many permanent teeth do we have? |
32 |
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what are the 8 teeth we have in each quadrant? |
2 incisors 1 canine 2 premoalrs 3 molars |
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what are the precursurs of the permanent teeth? |
20 baby teeth - precursor for molars |
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what is the first stage of tooth development? |
Bud stage Neuroectodermal cells induce the overlying epithelial cells to proliferate and from an invaginating tooth bud |
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what cells can we find at the bud stage? |
oral epithelium invaginating (ectodermal cells) , mesenchyme , cranial neurocrest cells |
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what is the second stage of tooth development? |
cap stage the epithelial tooth bud forms a cup-like structure under the influence of cytokines secreted by cells in the mesenchyme |
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what forms in the second stage of tooth development? |
cap stage dental papilla - neucrest cells & mesenchyme dental sac |
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what is the 3rd stage of tooth development? |
late cap stage the epithelial tooth bud is lined by an outer and inner (ameloblasts) enamel epithelium |
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what does the inner enamel epithelium develop into? |
a single layer of ameloblasts |
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when do odontoblasts form? |
at the late cap stage develop from cranial neural crest in the dental papilla |
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what do the pre-ameloblasts produce? |
enamel |
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what do the odontoblasts make? |
dentin |
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what is the fourth stage of tooth development? |
Bell stage -> inner enamel epithelium (ameloblasts) secrete enamel -> outermost cells of the dental papilla (odontoblasts) secret dentin |
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what is the 5 stage of development? |
tooth eruption dental sack gives rise to cementoblasts -> cementum, and periodontal ligament is fromed |
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what froms from the dental sack? |
cementum periodontal ligament |
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what does the dental papilla eventually develop in? |
dental pulp |
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what is the role of periodontal ligament? |
it anchors cementum to the alveolar bone |
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where do we find odontoblats? |
they line the pulp cavity |
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what happens to the ameloblast? |
once the tooth erupts all the ameloblasts disappear |
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what is the composition of dentin? |
20% organic (type I collagen) 80% hydroxypatite and fluroapatite |
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what are dentinal tubules? |
basically projections of the odontoblasts in the dentin |
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where is there active tranport (removal) of NaCl? |
in the striated duct of salivary gland |
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what are the product of the duct cells (striated duct in salivary gland)? |
Bicarbonate reabsorption of NacCL |
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what can be found in the salivary gland acinus? |
secretions: mucinus, proteins, enzymes |
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what is transported into the salivary gland acinus? |
Na+ (active) Cl- (active) water (passive) IgA (from plasma cell) |
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what is an example of simple tubular gland? |
intestinal glands of lieberkuhn |
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what is an example of simple coiled tubular gland? |
sweat gland |
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what is an example of simple branched tubular? |
gastric, uterine glands |
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what is an example of simple acinar? |
sebaceous |
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what is an example of a compound tubulo-acinar/tubular gland? |
salivary glands prostate gland / gastric cardia pyloric glands |
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what is an example of a compound acinar gland? |
pancreas |
