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15-Oral Histology brainscape Flashcards

1
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Lip *Small Arrow =fully keratinized stratified squamous epithelium *Large Arrow= hair

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Lip *Arrow- fully keratinized stratified squamous epithelium *SB- Sebaceous gland *Green- hair follicle

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3
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Inside of the lips *Between arrows= keratinized stratified squamous epithelium

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Cross Section Through Anterior 2/3 of Tongue *F= Fungiform Papillae *V= Circumvallate Papillae

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SKeletal muscle in cross section of the tongue

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Filiform Papillae = DO NOT HAVE TASTE BUDS

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Fungiform Papillae *Taste buds at the arrow

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8
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Circumvallate PapillaeYellow Arrow = Duct of von Ebner White Arrow= gland of von Eber

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9
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Taste bud in the valley of Circumvallate Papillae

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10
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Tatse Bud: Green arrow: Basal cells (stem, progenitor cells) Pink Arrow: Supporting cells Small Black: Sensory cells

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11
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Teeth of an infant

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Teeth of an adult

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13
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d= dentin p= pump small arrow= odontoblasts Large argow- space between dentin & ameloblasts

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14
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d= dentin p= pulp cavity o= odontoblasts a= ameloblastic layer Large arrow= enamel small arrow= predentin

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15
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16
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arrow= enamel d= dentin p= pulp cavity a= alveolar bone

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17
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e= enamel d= dentin p= pulp cavity *Can also see lines of Retzius

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18
Q

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D= Dentin P= pulp cavity e= enamel

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19
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D= Dentin C= Cementum small black arrows= cementocytes yellow arrow= dentin tubules

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20
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d= dentin p= pulp cavity a= alveolar bone s- gingival sulcus arrow near bottom of tooth= periodontal ligament thin red line on tooth= cementum

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21
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G= gingival sulcus Arrow= transition to non-keratinized stratified squamous epithelium

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22
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a= alveolar bone p= periodontal ligament c= cementum d= dentin

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23
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Parotid Gland - entirely serous (interlobular duct seen near the arrow)

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24
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Interlobular duct in the parotid gland

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\*Parotid DuctSmall intercalated duct at white arrow leading to larger striated duct (SD)
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Parotid from old person (lots of fat)
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Submandibular Gland \*Yellow arrow= striated ducts Black arrow= mucous cells other darker cells = serous cells
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Serous demilunes in a submandibular gland
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Sublingual gland- serous cells only at arrows, everything else is mucous
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Serous Cell: N= nucleus M= Mitochondria RER= Rough ER
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Apical Foramen
Valley within the alveolar bone extension through which the root canal comes through. Contains all blood vessels and nervous tissue that supply the pulp
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Cell Type of salivary Glands
1) Serous Cells 2) Mucous cells 3) Myoepithelial cells 4) Plasma cells
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Cells of Taste Buds
1) Sensory cells 2) Supportive Cells 3) Progenitor Cells (aka basla cells) \*Taste hairs - located on the top of each taste bud
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Cementum
bone-like calcified matrix that covers the dentin of the root \*Produced by cementocytes \*Provides anchor-sites for Sharpey's fibers cemetoclasts withing the lacunae cementoblast in exteriro border
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Circumvallate Papillae
\*Large circular structures (10-12) each with surrounding "moat" located just in front of the sulcus terminalis
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Classification of Parotid, Submandibular, Sublingual Glands
Parotid= Compound Acinar Submandibular= Compound tubulo-acinar Sublingual= Compound tubulo-acinar
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Composition fo the external surface of the cheek
keratinized stratified squamous epithelium
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Dental pulp
Gelatinous CT that fills the pulp cavity including the root canal \*Highly vascularized & innervated
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Dentin
Hard but resilient calcified tissue (70% dry weight) \*Organic matrix (predentin) is here and produced by odontoblasts (which is not shed, we can keep making dentin as long as our teeth are vascularized) exam ?
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Difference between odontoblasts & ameloblasts
\*Odontoblasts --\> Dentin (blasts are protected, located in pulp cavity and continue to make dentin once tooth erupts) They are simple columnar epithelium cells. \*Ameloblasts --\> Enamel (blasts are shed once tooth protrudes into oral cavity)
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Differences between the epidermis of the skin & the oral mucous membrane
1) Mucous membrane is stratified squamous epithelium (mostly nonkeratinized) 2) Wet mucosa 3) Highly permeable to certain substances especially sublingually and on the ventral surface of the tongue
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Enamel
hardest structure in the body- 95% calcified (hydroxyapatite) \*Produced by ameloblasts, but they degenerate during tooth eruption so the enamel part of the tooth cannot repair itself Lie down enamel in layers that form Lines of Retzius
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Epithelium of Parotid, Submandibular, and Sublingual glands
Parotid= All serous Submandibular= Mostly serous with some mucous Sublingual= Mostly mucous with some serous
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Filiform Papillae
most numerous lingual papillae- keratinized, do not have taste buds
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Fungiform Papillae
look like mushrooms, interspersed especially near tip of tongue, contain a few taste buds
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Glands of Von Ebner (TEST Question!)
located below the circumvallate papillae- deliver serous secretions into the moat for cleansing
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How many deciduous (baby/milk) teeth are there?
20
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Intercalated Duct prevalence in Parotid, Submandibular, and Sublingual glands
Parotid- Abundant Submandibular- Less prominent Sublingual- Absenet
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Interstitial fat prevalence in Parotid, Submandibular, and Sublingual glands
Parotid- Abundant Submandibular- few or no fat Sublingual- no fat
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Lingual Papillae
Filiform Fungiform Circumvallate
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Lining of the nasopharynx
Pseudostratified ciliated columnar epithelium
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Lining of the oropharynx
Nonkeratinized stratified squamous epithelium
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Minor Salivary Glands
\*Primarily mucous secreting glands \*Located in the submucosa of the oral epithelium \*Not encapsulated, short ducts, continuous secretion
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Mucous cells of salivary glands
\*Usually cells are bleached out \*Nuclei flatted, located on basal surface \*secretion contains mucin for lubrication
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Myoepithelial cells
cells in salivary glands that can facilitate the movement of saliva by contract and squeeze the contents of the cells into the lumen
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Number and type of permanant teeth
\*Incisors = 8 (single root) \*Canine = 4 (single root) \*Premolars = 8 (double root) \*Molars = 12 (two or three roots)
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Only location in the body where we have skeletal muscle traveling in three different planes
The tongue
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Parotid Gland
Produces 25% of saliva \*Largest salivary gland - serous type (compound alveolar) \*Lots of IgA secreting plasma cells \*Opens on inner surface of cheek across from upper second molars
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Periodontal Ligament
Dence CT which sends fibers into cementum which secure tooth to bony socket - acts as shock absorber and allows limited movement of tooth in socket
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Regions of a tooth
Crown- enamel covered part that extends above the gingival Root- Cementum covered part below the gingival that anchors teeth in the alveolar socket Neck- cemento-enamel junction
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Salivary control: Parasympathetic vs Sympathetic
Sympathetic stimulation: thick, viscoid secretion (dry mouth) Parasympathetic stimulation: copious watery secretions
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Semi demilune
occur when there is a mixture of serous and mucous cells
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Serous cells of salivary glands
\*Stain dark \*Nuclei are round, in a central position, have abundant zymogen granules \*Will cluster together to form acinus (grape like cluster) \*Secretion rich in water, electrolytes, amylase, IgA, and lactoferrin
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Sharpey's Fibers
attach the cementum to the periodontal ligaments gives tooth some mobility so that trauma does not always knock teeth out
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Steps in Teeth Formation
1) Tooth formation begins 6-7 weeks of gestation 2) Crown formation begins before root formation 3) Root formation occurs after crown is mostly completed and is accompanied by tooth eruption
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Striated Duct prevalence in Parotid, Submandibular, and Sublingual glands
Parotid- Abundant Submandibular- Abundant Sublingual- Absent
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Striated Ducts
special ducts lined with mitochondria, columnar cells, and basal foldings that can modify the primary secretion through active transport
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Stroma of Parotid, Submandibular, and Sublingual glands
Parotid= heavy capsule Submandibular= less prominent capsule Sublingual= no capsule
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Sublingual Glands
Produce 5% of saliva \*Smallest of the glands \*Mixed type (has serous demilunes) but mucous predominates (rich mucin)
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Submandibular glands
Produce 70% of saliva \*Mixed type (serous predominate) with serous demilunes
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Sulcus terminalis
V-shaped shallow groove separating palatine and pharyngeal portions
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Tissue of the gingival sulcus
space between the free gingival and crown- lined by non-keratinized epithelium
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Type of Excretory Duct in Parotid, Submandibular, and Sublingual glands
Parotid- Stenson's Submandibular- Wharton's Sublingual- Bartholin's
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Vermillion zone
red area of the lips \*Transition between keratinized and nonkeratinized epithelium. Abundant dermal capillaries, no hair or sweat glands
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Where are taste buds located throughout the mouth?
\*Tongue, soft palate (including uvula), pharyngeal wall, epiglottis, and larynx \*Some may be found in lips, cheeks, upper third of esophagus. Number decreases with age
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Where is the largest concentration of taste buds?
In the moat of the circumvallate papillae
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lips characteristics exam question!!
no hair or sweat glands! (exam ?) stratum corneoum is thinner and stratum lucidum is thicker. That is why you see blood in lips from dermal papilla
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keritinized areas in mouth
hard palate gums surface of tongue (all involved in mastication
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portion under the tongue are very \_\_\_\_\_ clinical relevant because\_\_\_\_\_
porous drug delivery (nitroglycerine)
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dental sac gives rise to
periodontal ligament and cementin
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enamel organ gives rise to the dental papilla gives rise to
enamel
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the dental papilla gives rise to
dentin
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HNSS (17 decks)

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