Lecture 2 - Histology 1 (Baekey) Flashcards Preview

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what are the 3 different layers of lips within the oral cavity?

1. mucosa
2. submucosa
3. core


what cell type is found within the mucosa of the lips?

stratified squamous epithelium (keratinized in herbivores not carnivores)


what type of tissue do you find within the core layer of the lips?

fibroelastic connective tissue and skeletal muscle


what does the primary palate form from?

caudal growth of the medial palatal process


what does the secondary palate form from?

lateral palatal processes that elevate and grow medially and use in the center with the primary palate and nasal septum


in what species do you most commonly see a cleft palate? what is it caused by?

brachycephalic dogs, Abyssinian cats

can be caused by ingestion of lupine (wildflowers) by pregnant sheep or cattle


what layers do you see within the hard palate

1. mucosa - keratinized stratified squamous epithelium
2. lamina propria - extensive vascular beds for heat exchange


what is the function of the soft palate?

divides oropharynx and nasopharynx


what is on the dorsal and ventral surface of the soft palate?

dorsal surface: nasopharynx w/ respiratory epithelium
ventral (oral) surface: keratinized stratified squamous epithelium


what are the layers of the soft palate?

1. lamina propria
2. core: fibrous connective tissue and skeletal muscle


what cell types do you find in the tongue?

stratified squamous epithelium covering a core of skeletal muscle


what are the 5 different tyeps of papillae?

1. filiform
2. conical
3. fungiform
4. foliate
5. vallate (circumvallate)


what characteristics about filiform papillae are significant?

its keratinized (especially in cats) and in rows


what characteristics about conical papillae are significant?

keratinized; located on dorsal surface of root


what characteristics about fungiform papillae are significant?

gustatory (taste buds), scattered


what characteristics about foliate papillae are significant?

taste buds, serous glands at base


what characteristics about vallate (circumvallate) papillae are significant?

ringed by furrow; taste buds; serous glands at base


what cell types do you find in taste buds?

gustatory cells
sustentacular cells
basal cells
nerve fibers


location of tastes

sweet = tip of tongue
salt = tip
sour (acid) = sides
bitter = region of circumvallate papillae


taste is mediated by what cranial nerves?

7, 9, and 10


describe the development of teeth

1. invagination of oral ectoderm forms dental lamina
2. dental buds form at base of dental lamina
3. dental buds differentiate into inverted cups called enamel organs, which produce deciduous teeth


what is dental papilla derived from?
and what does it form?

dental papilla is derived from neural crest

forms from tooth dentin and pulp


define eruption

occurs in each deciduous tooth as downward growth of root exerts pressure against alveolar bone, and the crown is forced upward to break through enamel organ and gingiva


describe the development of permanent teeth

a second bud forms off of the dental lamina. the growing permanent tooth puts pressure on the root of the deciduous tooth, causing the root to be resorbed and the deciduous tooth to fall out


what is an example of ectopic teeth?

ear teeth in horses


what are the 3 cell types seen in teeth

1. ameloblasts
2. odontoblasts
3. cementoblasts


describe ameloblasts

apical processes (Tome's processes) secrete slightly mineralized rods; mineralization initiates in rods, forming enamel (the hardest substance in the body)


describe odontoblasts

neural crest origin
- deposit predentin at the dentinoenamel junction
- predentin is mineralized, forming dentin
- odontoblastic processes extend as odontoblasts retreat


describe cementoblasts

forms cementum which binds dentin to alveolar bone via peridontal ligaments


what are the two types of teeth?

1. brachydont
2. hypsodont

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