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Histology 2 > Salivary Glands and Oral Mucosa > Flashcards

Salivary Glands and Oral Mucosa Flashcards

1
Q

Oral Mucosa

Consists of what?

A

Stratified squamous epithelium, lamina proporia and submucosa (dense and loose connective tissue respectively)

Epithelium keratinized in some areas

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2
Q

Non-Keratinized Oral Mucosa

A
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3
Q

Tongue

Intrinsic muscle bundles

A

Longitudinal, Transverse and Vertical

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4
Q

Papillae

Filifofrm (FL)

A

Conical shape, no taste buds (unlike other 3)

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5
Q

Taste Bud

What are they?

A

Multicellular chemoreceptive units

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6
Q

What does saliva do?

Protection

A

Flushes away non-adherent bacteria, debris, sugar

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7
Q

Saliva

How much per day?

A

600-1000ml a day

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8
Q

Major glands

3 major pairs

A

Parotid glands, submandibular glands and sublingual glands

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9
Q

Structure of Salivary glands

Stroma

A

Tough connective tissue capsule, with septa dividing gland into lobes/lobules.

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10
Q

Merocrine Secretion

Occurs…

A

By exocytosis. When membranes of secretory vesicles fuse with cell membrane and discharge contents into extracellular space

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11
Q

Classification of Exocrine Glands by Duct Morphology

Simple

Compound

A

Unbranched

Has a branching duct system

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12
Q

Classification of Exocrine Glands by Arrangement of Secretory Cells

Tubuloacinar

A

Secretory tubules ending in secretory acini

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13
Q

Salivary glands

Secretory elements

A

Either serous or mucous

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14
Q

Serous and Mucous cells

A
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15
Q

Cells of Serous Acini

Shape

A

Typically wedge shaped

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16
Q

Cells of Mucous Acini

Found

A

In tubular element of tubulo-acinar glandular structure.

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17
Q

Serous Demilune

What is it?

A

Serous cells appearing as a crescent shaped collection of cells at the end of the secretory unit. Thought to be an artifact

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18
Q

Duct System of Major Salivary Glands

Acinus empties into

A

Intercalated duct consisting of cuboidal cells

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19
Q

Intercalated Duct

Empties into

Cells of striated duct

A

Striated duct

Are columnar, and have their nucleus in a central position with prominent striations at the basal surfaces.

20
Q

Collecting ducts (excretory ducts)

Emptied into by…lobular

Lined by

A

Striated ducts - Interlobular

Lined by pseudostratified columnar epithelium with tall columnar cells and small basal cells

21
Q

Serous vs Mucous

A
22
Q

Submandibular Gland

A
23
Q

Minor Glands

Found where?

Absent

What ones?

A

Scatted throughout oral mucosa

Gingiva and anterior hard palate

Lingual, minor sublingual, labial, palatine and buccal glands

24
Q

Minor Glands

A
25
Q

Von Ebner’s Glands

A
26
Q

Tongue

Dorsal surface

A

Has keratinized stratified sqamous epithelium on the bottom with dense irregular lamina proporia tying the epithelium to the muscle

27
Q

Papillae

Fungiform (FG)

A

Blunt

28
Q

Papillae

Foliate

A

Slit-like on margin of tongue

29
Q

Papillae

Circumvallate

A

Large, dome shaped. 6-12 in two lines forming a “v” about 2/3 back on the tongue. Cleft around them.

30
Q

What does saliva do?

Buffering

A

Bicarbonnate protects teeth

31
Q

What does saliva do?

Tooth integrity

A

High levels of calcium and phosphate for remineralization

32
Q

What does saliva do?

Antimicrobial activity

A

Mucins provide a barrier - antibacterial enzymes.

33
Q

What does saliva do?

Digestion

A

Fluid and mucin components aiding in formation and swallowing of food bolus.

34
Q

What does saliva do?

Taste

A

Able to help solubilize food so it can go to taste receptors

35
Q

Saliva

How much is water?

A

99% water

36
Q

Saliva

Secretion types?

A

Constitutive secretion and one under nervous control

37
Q

Saliva

Where does 90% come from?

A

Comes from 3 pairs of major salivary glands

38
Q

Major glands

Location

A

Located outside of oral cavity and have extensive duct systems

39
Q

Major glands

Minor glands

A

Lots in oral mucosa. Typically located in submucosa and have short ducts that open onto the mucosal surface

40
Q

Structure of Salivary glands

Parenchyma

A

Compound tubulo-acinar glands. Serous acini, mucous acini and mixed acini - type present depends on gland. Secretion is merocrine.

41
Q

Salivary glands

Serous cells

A

Thin, watery secretion containing proteins (like amylase) and ions. Not ultrafiltrate of blood but produced via active secretion.

42
Q

Salivary glands

Mucous cells

A

Produce mucin. Consists of a protein core highly decorated with sugar residues resulting in a viscous, sticky secretion.

43
Q

Cells of Serous Acini

Nucleus

A

Prominent and in basal part of cell

44
Q

Cells of Serous Acini

RER

A

Extensive RER

45
Q

Cells of Serous Acini

Appearance

A

Granular appearance due to large numbers of apical secretory granules

46
Q

Cells of Mucous Acini

Granules

A

Large numbers of prominent mucin granules packing the cytoplasm

47
Q

Cells of Mucous Acini

Nucleus

A

Compressed towards basal part of cell

Histology 2 (12 decks)

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