Flashcards in GI Histo Deck (75)
space between lip, cheeks, and teeth
hard and soft palates, tongue, floor of mouth, and entrance to oropharynx
Oral cavity proper
What are the 3 types of mucosae in the oral cavity
Masticatory: SSE keratinized or parakaratinized
(mucosa on gingiva and hard palate)
Specialized: SSE keratinized
(dorsum of the tongue)
Lining: SSE non keratinized
What makes the specialized mucosa specialized?
Different/unique types of papillae
Strengthen mucosal stability of masticatory mucosa
Deep papillae from the underlying lamina propria
what is the distribution of papillae on the tongue?
-Ant 2/3 tongue = filiform with scattered fungiform
-Divides the ant 2/3 from the post 1/3—there are 8-12 circumvallate papillae in a row
-on lateral edges of tonge: foliates
Papillae on tongue that does not have taste buds
Filiform (fount on ant 2/3—the taste buds are found in the fungiform papillae in this area, they are scattered among the filiform)
Papillae on tongue that is keratinized
Filiform and some fungiform
What are the cells found in taste buds?
Sensory, supporting, and basal
Predominate cell type in a taste bud
Cells in the taste bud that synapse with afferent nerve fibers
What are the known tastes
Sweet, salt, bitter, umami
What is umami??
The taste of L-glutamate in monosodium glutamate (MSG) and asparagus
T or F: a sensory cells has a heterogenous mixture of sensory receptors
F: each sensory cell contains only 1 receptor type
T ort F: taste buds contain a heterogenous mixture of sensory cell types
What type of taste is generally limited to the back of the tongue
**all others are distributed all over the tongue
Other than the tongue where are taste buds also found?
Roof of mouth
What are the major salivary gands?
Parotid, submandibular, and sublingual
Where are the minor salivary glands found?
CT of the cheek, tongue, and palate
What are the cell types in salivary gands?
Serous (pink) and mucous (blue)
What do the serious cells in salivary glands secrete?
Water substance with protein, amylase, and lysozyme
Describe the structural organization of the salivary glands
Acini of mucosal cells or serous cells covered in myoepithelical cells that when contracted will force secretions of acini into intercalated ducts and striated ducts
What is the difference between intercalated ducts and striated ducts?
Intercalated ducts are simple cuboidal and secrete and abs to modify secretion
Striated ducts are simple cuboidal to simple columnar and striations are caused by basal plasma membrane and aldso modify secretions
??? not too sure need to wiki
Aka for excretory ducts of salivary glands
**do not modify secretions
Distinctions of the 3 salivary glands (types of acini)
Parotid is purely serous acini
Submandibular is mixed but mostly serous
Submandibular is mixed
Sublingual is mixed but mostly serous
What is a serous demilune and what gland(s) contain it?
In submandibular glands: serous cells forming a cap over the mucinous acini
Buffers content in oral cavity
Digestive enzymes present in saliva
Amylase and lipase
Role of saliva in health of teeth
Has protein that forms a protective film
Contains Ca and PO4 for minetalization of teeth