where is the masticatory mucosa
gingivae and hard palate
What does the masticatory mucosa lack
submucosa on gums and palatine raphe
what is burton's line?
blue-gray gingival margin because of lead poisoning
what is lining mucosa?
nonkeratinized stratifies squamous--most of the oral cavity is this type
three layers of the lining mucosa?
stratum basale, spinosum and superficiale
What mucosa is associated with tase?
4 types of papillae
filiform, fungiform, circumvallate, foliate
keratinized stratified squamous epithelium--no taste buds
mushroom shaped, abundant at tip of tongue
8 to 12 large papillae in front of sulcus terminales, surrounded by lingual salivary glands (von Ebner's glands) that secrete into "moat" surrounding the papillae
lateral sides of tongue, stratified squamous, taste buds, small serous glands empty into clefts
3 types of taste bud cells
neuroepithelial (synapse with CN VII, IX and X), supporting cells (turnover in 10 days), basal cells (stem cells)
three regions of lip
skin, vermilion zone, mucosa
skin of lip
stratified squamous keratinized with hair and sweat glands
thin skin that allows red of blood to show--no sweat or hair
mucosa of lip
stratified squamous nonkeratinized epithelium with lamina propria--submucosa deep to mucosa contains labial salivary glands
major salivary glands and their secretions
parotid (serous), submandibular gland (serous and mucous-mucous predominant), sublingual gland ( mixed with mucous predominant)
What is in saliva?
protein (protective pellicle on teeth), enzymes (amylase, lipase, lysozyme, lactoperoxidase), ions, mucins, IgA, Lactoferrin
crown of tooth composed of?
root of tooth composed of?
anatomic crown v. clinical crown?
clinical is what is exposed above the gumline
what makes up most of enamel?
calcium hydroxyapatite-hardest substance in body
where is enamel derived from/
epithelial tissue--not replaced once formed
what are the protein components of enamel?
enamelins and tuftelins
what can cause damage to enamel?
carious lesions, bulimia
stages of tooth development
bud, cap, bell, appositional dentin and enamel, tooth eruption, and functional tooth
invagination of oral epithelium into mesenchyme, mesenchymal cells form primordium of dental papilla
inner enamel epithelium--ameloblasts, neural crest cells of neuroectoderm differentiate into odontoblasts
cells of stratum intermedium transport substances to ameloblasts
enamel formation--matrix production by secretory ameloblasts (Tome's process is apical end of ameloblast). Matrix maturation is carried out by maturation-stage ameloblasts.
cementoblasts (from mesenchyme) secrete it. Cemetocytes and processes are found in lacunae and canaliculi along root. Cementum is avascular. Sharpey's fibers are periodontal ligament
similar to bone but has dentin phosphoprotein and dentin sialoprotein. Secreted by odontoblasts (derived from neural crest cells of mesenchyme). Dentinal tubules are formed by odontoblasts embedded in dentin (exposure increases tooth sensitivity. Dentin is secreted throughout life
dental pulp and pulp cavity
has vessels and nerves. cavity becomes smaller as dentin is added inside tooth