Salivary Glands And Oral Tissue Flashcards Preview

Histology > Salivary Glands And Oral Tissue > Flashcards

Flashcards in Salivary Glands And Oral Tissue Deck (65):
1

what are the three types of oral mucosa

Lining mucosa, masticatory mucosa and specialised mucosa

2

What does the oral mucosa consist of

Stratified squamous epithelium, a lamina propria of dense connective tissue and a submucosa of loose connective tissue

3

Where is masticatory mucosa found

Covering the hard palate and gingiva

4

Characteristic of masticatory mucosa

It is keratinised or para-keratinised

5

Where is lining mucosa found

Inside of the lips, lining the buccal surfaces, covering the soft palate, covering the floor of the mouth and inner surface of the tongue

6

Is lining mucosa keratinised

No

7

Dorsum of the tongue

Keratinised epithelium and numerous papillae

8

Is the vermillion border of the lips keratinised

Yes

9

Orientations of intrinsic skeletal muscle in the tongue

Longitudinal, transverse and vertical

10

Epithelium of dorsum of tongue

Keratinised stratified squamous

11

Lamina propria of dorsum of the tongue

Dense irregular connective tissue that ties the epithelium to the underlying muscle

12

What are the four types of papillae

Filliform, fungiform, foliate and circumvallate

13

Characteristics of filiform

Conical shaped with no taste buds

14

Characteristics of fungiform

Blunt with taste buds

15

Characteristics of folite

Slit-like at the margin of the tongue with taste buds

16

Characteristics of circumvillate

Large, dome-shaped with a cleft surrounding them with taste buds at the margin of the papillae

17

What are taste buds

Multicellular chemoreceptive units that span the epithelium

18

What is saliva involved in

Protection, buffering, tooth integrity, antimicrobial activity, digestion and taste

19

What does the fluid component of saliva do

Flush away non-adhesive bacteria, debris and sugar

20

Function of mucins

Provide lubrication for oral tissues to move

21

Function of bicarbonate

Protects the teeth from bacterial acids

22

Function of calcium and phosphate

Helps enamel to mature and increases hardness and resistance to demineralisation

23

What aids in the formation and swallowing of a food bolus

Fluid and mucin components of saliva

24

What begins the process of breaking down food

Enzymes such as amylase

25

What are the 3 major salivary glands

Parotid, submandibular and sublingual

26

Where are the major salivary glands located

Outside the oral cavity

27

Where are the minor salivary glands located

In the oral mucosa - typically in the submucosa

28

Where do the ducts from the minor salivary glands open onto

The mucosal surface

29

What is the stroma of salivary glands

A tough connective tissue capsule with septa of connective tissue that subdivide the glands

30

What travels within the septa of salivary glands

Blood vessels, nerves and major ducts

31

What is the parenchyma of salivary glands composed of

Compound tuboacinar glands

32

What are the secretory elements of the salivary glands

Serous acini, mucous acini and mixed acini

33

How is secretion produced

By merocrine secretion

34

How does merocrine secretion occur

By exocytosis

35

What are the different types of duct morphology

Simple and compound

36

What are the different types of arrangement of secretory elements

Tuboacinar

37

How can glands be classified

By duct morphology and arrangement of secretory elements

38

What type of glands are salivary glands

Compound tuboacinar glands

39

Different classification of secretory elements in salivary glands

Serous and mucous

40

What do serous cells secrete

Thin watery secretion that contains proteins and ions

41

What do mucous cells secrete

Mucin which consists of a protein core that is highly decorated with sugar residues - this results in a viscous, sticky secretion

42

Cells of the serous acini

Wedge shaped with a prominent nucleus in the basal part of the cell
Have extensive rER and a granular appearance due to the apical secretory vesicles

43

Cells of the mucous acini

Found in the tubular element of the tuboacinar glandular structure
Have large number of secretory granules packing the cytoplasm

44

What happens to the nucleus in routine staining

Typically pushed to the basal surface of the cell by granules

45

What is a serous demilune

An artifact present in staining

46

What do the population of epithelial cells surrounding the secretory cells of salivary glands do

Contract

47

What does the acinus empty into

Intercalated duct

48

Intercalated duct epithelium

Simple cuboidal

49

What does the intercalated duct empty into

Striated duct

50

Cells of striated duct

Columnar with their nucleus in a central position and have prominent striations at the basal surface

51

What are the striations within a striated duct

Infoldings of the cell membrane accompanied by lines of mitochondria

52

Why do striated ducts require mitochondria

To power the molecular pumps

53

What cells do striated ducts pump out/in

Na+ ~ out
K+ and HCO-3 ~ in

54

What is the net effect of ions being taken out/added into the saliva

A hypotonic saliva

55

What are both intercalated and striated ducts

Interlobular

56

What do striated ducts empty into

Secretory ducts

57

Where are secretory ducts found

Within the connective tissue

58

Lining of secretory ducts

Pseudostratified columnar epithelium with tall columnar cells and small basal cells

59

Function of the small basal cells

Stem cells

60

Lining of merged duct

Stratified squamous epithelium

61

What is the main form of minor salivary glands

Mucous

62

Examples of minor secretory glands

Lingual, minor sublingual, labial, palatine and buccal

63

What are the entirely serous minor glands

Von Ebners glands

64

Where are von Ebner's glands found

Associated with circumvillate and foliate papillae and open into the cleft

65

What is the function of the secretion from von Ebner's

Help to dissolve food molecules to aid taste and also keep the cleft flushed to allow for the next taste