GI system I Flashcards Preview

Year 1 Cell Biology > GI system I > Flashcards

Flashcards in GI system I Deck (42):
1

What are the three types of mucosa in the oral cavity?

1. Masticatory mucosa2. Lining mucosa3. Specialized mucosa

2

Where is the masticatory mucosa located?

Gingivae and hard palate

3

What type of epithelium makes up the masticatory mucosa?

Keratinized and parakeratinized stratified squamous epithelium

4

Which parts of the masticatory mucosa lack a submucosa?

Gingivae and palatine raphe

5

What is contained in the anterior submucosa of the hard palate?

Adipose CT

6

What is contained in the posterior submucosa of the hard palate?

Mucous glands

7

What anchors the mucosa to the periosteum of the hard palate?

Collagen fibers

8

What type of epithelium makes up the lining mucosa?

Nonkeratinized stratified squamous (parakeratinized in some areas)

9

What are the layers of the lining mucosa?

1. Stratum basale2. Stratum spinosum3. Stratum superficiale

10

What is associated with the specialized mucosa of the oral cavity?

Taste

11

What are the four types of papillae on the dorsum of the tongue?

1. Filiform2. Fungiform3. Circumvallate4. Foliate

12

What type of epithelium covers the filiform papillae?

Keratinized stratified squamous

13

What is the only lingual papilla that does NOT have taste buds?

Filiform papillae

14

What type of epithelium covers the fungiform papillae?

Stratified squamous epithelium, partial keratinization

15

Where are the taste buds located in the circumvallate papillae?

In the stratified squamous epithelium

16

What glands empty into the region surrounding the circumvallate papillae?

Lingual salivary glands (von Ebner's glands, serous)

17

What type of epithelium covers the foliate papillae?

Stratified squamous with taste buds

18

What empties into the clefts of foliate papillae?

Small serous glands

19

What are the three cell types of taste buds?

1. Neuroepithelial (sensory) cells2. Supporting cells3. Basal cells

20

What are the characteristics of the neuroepithelial (sensory) cells?

1. Apical surface have microvilli2. Connected to neighboring cells via tight junctions3. Form synapses with CN VII, IX, or X

21

What are the characteristics of the supporting cells in taste buds?

1. Contain microvilli and tight junctions2. Prevent cross talk between sensory cells

22

What are the characteristics of the basal cells in taste buds?

1. Located near basal lamina 2. Serve as stem cell population

23

What lies deep to the mucosa of the lip?

Submucosa which houses labial salivary glands

24

What kind of secretory cells make up the parotid gland?

Only serous

25

What kind of secretory cells make up the submandibular gland?

Primarily serous, some mucous

26

What kind of secretory cells make up the sublingual gland?

Primarily mucous, some serous

27

What is the acquired pellicle?

Protective protein coat on teeth

28

What are the enzymes in saliva?

1. Amylase2. Lipase3. Lysozyme4. Lactoperoxidase

29

What is the role of lactoferrin in saliva?

Antibacterial - binds iron so that bacteria cannot use it

30

Which antibody is contained in saliva?

IgA

31

What are the layers of the tooth?

1. Enamel - covers anatomic crown, absent at root2. Dentin - present in crown and root3. Cementum - covers root, absent at anatomic crown

32

What covers the root?

Cementum only

33

From what tissue is enamel derived?

Epithelial tissue

34

What are the stages of tooth development?

1. Bud stage2. Cap stage3. Bell stage4. Amelogenesis

35

What characterizes the bud stage?

1. Invagination of oral epithelium into the mesenchyme2. Mesenchymal cells form the primordium of the dental papilla3. Cells of epithelial tooth bud secrete FGR-4 and BMP-2,4,7 to regulate shape

36

What characterizes the cap stage?

1. Inner enamel epithelium cells differentiate into ameloblasts2. At dental papilla neural crest cells of neuroectoderm differentiate into odontoblasts3. Induced by activin BA and BMP-4 secreted by mesenchyme4. Outer enamel epithelium, stellate reticulum, and stratum intermedium start to appear

37

What characterizes the bell stage?

1. Outer enamel epithelium2. Inner enamel epithelium3. Stratum intermedium - elaborate and transport substances to the ameloblasts4. Stellate reticulum - stellate appearing cells in an ECM of glycosaminoglycans and water

38

What characterizes amelogenesis?

1. Process by which enamel forms2. Mamtrix production or secretory stage carried out by ameloblasts directly on previously formed dentin3. Matrix maturation is carried out by maturation stage ameloblasts - removal of organic components of partially mineralized enamel

39

What characterizes maturation stage ameloblasts?

Ruffled borders

40

What are the characteristics of cementum?

1. Cementoblasts actively secrete cementum 2. Avascular3. Sharpey's fibers (type I collagen) run from cementum to bone of tooth socket

41

What are the characteristics of dentin?

1. Secreted by odontoblasts 2. Odontoblasts are derived from neural crest cells of adjacent mesenchyme3. Elongated processes of odontoblasts are embedded in dentinal tubules4. Secreted throughout life

42

How does the pulp cavity change with age?

Becomes smaller as more dentin is secreted