GI I:Oral Cavity Flashcards Preview

Cell and tissue > GI I:Oral Cavity > Flashcards

Flashcards in GI I:Oral Cavity Deck (86):
1

What is the masticatory mucosa?

The mucosa located on the gingivae, and the hard palate

2

What is the epithelial type that lines the masticatory mucosa?

Keratinized and parakeratinized stratified squamous epithelium

3

Where does the masticatory mucosa lack a submucosa?

on gingivae and palatine raphe

4

What is found on the anterior and posterior hard palate?

Anterior = adipose CT
Posterior = mucous glands

5

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

Collagen fibers

6

What is burton's line?

blue-gray gingival margin due to lead poisoning

7

Where is the lining mucosa found?

Over most of the oral cavity

8

What type of epithelium comprises the lining epithelium?

Nonkeratinized stratified squamous

9

What are the three layers of the lining mucosa?

1. Stratum basale
2. Stratum spinosum
3. Stratum superficiale

10

Where is the submucosa of the lining mucosa found?

Present except on inferior surface of tongue

11

Where is the specialized mucosa in the mouth?

Tongue, involved in taste

12

What are the four types of papillae?

1. Filiform
2. Fungiform
3. Circumvallate
4. Foliate

13

Which type of papillae are the most numerous, and found over the anterior 2/3rds of the tongue?

Filiform

14

What type of epithelium does the filiform papilae sit on?

keratinized stratified squamous epithelium

15

Which type of papili do not have taste buds?

Filiform

16

Where are fungiform papilae found?

tip of the tongue

17

Which papillae are mushroom shaped?

Fungiform

18

What is the epithelium that covers the ALL papillae?

Stratified squamous

19

What is the sulcus terminals?

Groove at the base of the tongue

20

What are the largest papillae? Where are they located?

Circumvallate-anterior to the sulcus terminalis

21

Where are the taste buds located on circumvallate papillae?

in the epithelial layer in the lateral margin

22

What are the serous glands that surround the moat region of circumvallate papilla? What is their function?

Lingual salivary glands (von Ebner's glands).

Function = secrete serous fluid into moats

23

Where are foliate papilae found? What shape are they?

Leaf shaped, on the margins of the tongue

24

What type of glands empty into the clefts that surround the foliate papillae?

serous glands

25

What are the three types of cells found in a taste bud?

1. Neuroepithelial (sensory) cells
2. Supporting cells
3. Basal cells

26

What specialization do the sensory cells of the taste buds have? What do these do?

Microvilli that project into the taste pore, and receive taste signals

27

What nerve(s) connect to the sensory cells of the taste buds?

CN 7, 9, and 10

28

What is the turnover rate of the sensory cells of the tastebuds?

10 days

29

What is the function of the supporting cells of the taste buds?

insulate sensory cells, and support them

30

What are the basal cells of the taste buds?

Stem cells found at the base of the taste bud

31

How do you distinguish the sensory cells of taste buds, from the surrounding supporting cells?

Larger, more euchromatic nuclei in the sensory cells

32

Do the supporting cells of the taste buds have microvilli?

Yes

33

What are the three regions that define the lip?

Skin, vermillion zone, mucosa

34

What type of epithelium is found over the mucosa of the lip?

wet stratified squamous, nonkeratinized epithelium with a lamina propria

35

Where in the lip does the epithelum have a submucosa? What does this contain?

On the interior surface deep to the mucosa and contains labial salivary gland

36

What is the vermillion zone? Does this have hair follicles or sweat glands?

Transition area where there is thin skin that allow the redness of blood to be visible.

Lacks hair follicles and sweat glands

37

Is there anything histologically special about the skin of the anterior part of the lip (that is not red)?

Nope.

38

What is the muscle that is in the lip?

Obicularis oris

39

What are the three major salivary glands of the mouth?

Parotid
Submandibular
Sublingual

40

What are the secretions of the parotid gland? What type of duct system does it use?

Purely serous
Compound acinar

41

What does the submandibular gland secrete? What type of duct system does it use?

i. Compound tubulo-acinar gland
ii. Mixed (serous and mucous) though serous predominant
iii. Serous demilunes are present

42

What does the sulingual gland secrete? What type of duct system does it use?

i. Compound tubulo-acinar gland
ii. Mixed though mucous predominant
iii. Serous demilunes are present

43

What does saliva contain?

1. protein
2. enzymes
3. ions
4. mucins
5. IgA
6. Lactoferrin

44

What are the four enzymes present in saliva?

a. Amylase
b. Lipase
c. Lysozyme
d. Lactoperoxidase

45

What is the acquired pellicle?

The coat of saliva around the enamel of teeth

46

What is the clinical crown?

Part of tooth exposed above the gum line

47

What are the three layers of the tooth?

i. Enamel (covers anatomic crown; absent at root)
ii. Dentin (present in crown and root)
iii. Cementum (covers root; absent at anatomic crown)

48

What is the different between the clinical and anatomic crown?

Clinical is only that which is exposed, anatomical is where there is a transition from enamel to dentin

49

What is the root of the tooth?

The part of the tooth covered by dentin, NOT enamel

50

Does the enamel have cells?

No

51

What percent of enamel is mineralized?

96-98% is calcium hydroxypatite

52

Enamel is derived from what type of tissue?

epithelial tissue

53

Is enamel replaced after it is formed?

No

54

What are the protein components of the enamel?

ENamelins and tuftelins

55

How is the calcium in the enamel arranged?

In rods that span the thickness of the enamel

56

What are the four stages of tooth development?

1. Bud stage
2. cap stage
3. bell stage
4. apposition dentin and enamel stage

57

What beings the bud stage of tooth development?

Invagination of oral epithelium into the mesenchyme

58

What sits at the base of the developing tooth bud? What is this area/what will it form?

Layer of mesenchymal cells that form the primordium of the dental papilla

59

What are the substances used in the bud stage of tooth development?

FGF-4
BMPS 2, 4, and 7

60

What defines the cap stage of tooth development?

Inner enamel epithelium – cells will differentiate into ameloblasts

61

What happens to the dental papilla (layer below the mesenchymal cells) in the cap stage of tooth development?

These neural crest cells of neuroectoderm will differentiate into odontoblasts

62

What chemical induces the cap stage of tooth development?

Activin Beta A
BMP 4

63

What are the four layers of cells present in the bell stage of tooth development?

1. Outer enamel epithelium
2. Stratum intermedium
3. Stellate reticulum (ameloblasts)
4. Inner enamel epithelium (odontoblasts)

64

What is the stratum intermedium in the bell stage of tooth development?

layer of cells that elaborate and transport substances to the ameloblasts

65

What are ameloblasts derived from?

Oral epithelium

66

What are odontoblasts derived from?

neural crest cells

67

What is amelogenesis?

process by which enamel is formed

68

Where do ameolblasts elaborate enamel?

onto the dentin formed by odontoblasts

69

What is Tome's process?

the apical end of the ameloblasts in amelogenesis

70

What is at the base of the ameloblasts?

Stratum intermedium

71

What cell types carries out matrix maturation of the enamel? What happens at this stage?

Maturation stage ameloblasts with ruffled borders which now take up organic components of pre enamel to form mature enamel.

72

When do ameloblats degenerate?

Around the time of tooth eruption

73

What is cementum?

Bone-like mineralized tissue that surrounds that dentin root of teeth

74

Is cementum vascular?

No

75

What is the function of cementoblasts? Where are they derived from?

secrete cemuntum
Derived from mesenchymal cells

76

Where are cementocytes found/

IN lacuna around the periodontal ligament

77

What suspends that matrix of the cementum of the bone socket?

College I (Sharpey's fibers)

78

What is the mineralized tissue that lies deep to enamel and cementum?

Dentin

79

What are the two proteins that dentin has that are necessary for mineralization?

dentin phosphoprotein and dentin sialoprotein.

80

What cell type secretes dentin?

Odontoblasts

81

What are odontoblasts derived from?

Neural crest cells

82

What are the dentinal tubules? What are the clinical significance of these when exposed?

Elongated processes of the odontoblasts embedded in dentin

Cause tooth sensitivity when exposed

83

Are dentin and enamel secreted throughout life?

Dentin is. Not enamel

84

What are the three types of dentin?

Peritubular dentin
Intertubular dentin
Dentinal tubule

85

What happens to the pulp cavity as we age?

Gets smaller

86

What does the pulp cavity contain?

loose CT and vessel/nerves