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Histology > Oral Cavity > Flashcards

Oral Cavity Flashcards

1
Q

Composition of saliva?

A

mixed secretion from all glands

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2
Q

What stimulates saliva secretion?

A

chemical, olfactory and/or psychic stimuli

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3
Q

What are the 6 functions of saliva?

A
  1. Moistens Oral cavity
  2. Cleans oral cavity
  3. Lubricates the food for swallowing
  4. Aids in taste sensation
  5. Digestive activity
  6. Immunological activity
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4
Q

What are three glands whose secretions make up saliva?

A

Parotid, submandibular, sublingual

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5
Q

Secretory granules of serous acini are rich in what enzyme?

A

Amylase - created in the serous units of all three salivary glands

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6
Q

Which salivary gland is the largest?

A

Parotid

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7
Q

Which salivary gland is paired?

A

Parotid - next to the ear on both sides

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8
Q

What is the Parotid gland surrounded by?

A

A fibrous capsule that invaginates around the parotid glands to make septa, lobes, lobules

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9
Q

Does the parotid gland have a ductal system?

A

Yes, ductal system is present in the parotid glands.

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10
Q

What is the composition of the secretory units in the parotid gland

A

All serous units

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11
Q

What is the composition of the secretory units in the submandibular gland?

A

75% serous, 25% mucosal units – mixed secretion

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12
Q

What is the composition of the secretory units in the sublingual gland?

A

75% mucosal, 25% serous units —mixed secretion

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13
Q

What is the typical shape of the secretory units in the salivar gland?

A

Both the mucous and serous units are acinar in shape.

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14
Q

What makes up serous secretions?

A

watery, proteinaceous secretion, which contains enzymes

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15
Q

What makes up mucousal secretions?

A

viscous glycoprotein

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16
Q

What is the role of myoepithelial cells?

A

Lie in contact with basal aspects of secretory cells –> serve a contractile role by promoting release of secretory product into lumina of excretory ducts

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17
Q

What is mucin?

A

mixture highly viscous glycoproteins that protect and lubricate surfaces – part of mucous

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18
Q

What are goblet cells? What are these types of cells called when grouped together?

A

singly found mucus-producing cells.

Tubules/acini - when grouped together

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19
Q

What are serous demilunes? what do they supply?

A

mucousal units are capped with serous demilunes – which are the source of lysozyme

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20
Q

Which salivary gland(s) are not well encapsulated?

A

sublingual gland - lacks a clear fibrous capsule

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21
Q

What is saliva?

A

watery, viscous suspension of mucus, enzymes, inorganic ions, and antibodies

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22
Q

Which gland produces the most saliva?

A

submandibular gland produces 60% of saliva, but is only the second largest.

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23
Q

Major ducts of parotid? submandibular?

A

Stenson. Wharton.

24
Q

What is the classification of the major salivary glands by shape?

A

compound tubuloacinar glands

25
Q

What are the three sections of a excretory duct?

A

Secretory acinus, intercalated duct, and striated duct

26
Q

what type of stimulation increases blood flow to the secretory acini of salivary glands?

A

parasympathetic stimulation

27
Q

What is primary secretion? Where is it made?

A

Primary secretion is released into the secretory acinus of excretory ducts.
- Composed of filtrate from cells, mucus, and amylase

28
Q

What do von Ebner glands secrete?

A

lingual lipase – added to saliva in the mouth

29
Q

What does the striated duct portion of an excretory duct do?

A

modification of ionic content of primary secretion

30
Q

What are intercalated ducts?

A

slender conduits that connect the secretory acinus to the striated duct
—composed of one layer of squamous or cuboidal epithelial layer

31
Q

What makes striated ducts?

A

columnar epithelial cells with basal striations

32
Q

What is the flow of the ductal system in the parotid glands?

A

Secretory acinus –> intercalated duct –> striated duct –> intralobular duct –> interlobular duct

33
Q

Where do most salivary gland tumors derive from?

A

ductal epithelium

34
Q

What are “striations” of the striated duct?

A

basal plasma membrane invaginations with an accumulation of mitochondria

35
Q

Are intercalated and striated ducts technically secretory?

A

Yes

36
Q

What is the tongue formed by?

A

interlacing bundles of striated muscle at various angles

—may be skeletal and smooth, not cardiac

37
Q

What is the sulcus terminalis?

A

separates the anterior 2/3 of the tongue from the posterior 1/3

38
Q

Why is the dorsal surface of the tongue so rough?

A

covered with papillae

39
Q

Which salivary gland lacks adipose?

A

submandibular

40
Q

What types of cells cover the tongue?

A

smooth nonkeratinized stratified squamous epithelium over dorsum and undersurface
—-except over filliform papillae -epithelium is parakaratinized

41
Q

Which are the most numerous papillae?

A

filliform

42
Q

What are von Ebner glands?

A

serous glands that drain into the base of each furrow of the circumvallate papillae
—-produce a watery fluid that helps clear debris from around taste buds to better expose them to gustatory stimuli

43
Q

What are the three main types of papillae on the tongue?

A

filliorm, fungiform, circumvallate

44
Q

What is the shape of filliform papillae

A

connective tissue core covered by para karatinized stratified squamous epithelium in an elongated conical shape

45
Q

Where and how are filliform papillae found?

A

Found in rows parallel to median sulcus

46
Q

Do filliform papillae contain taste buds?

A

No, filliform papillae do not contain taste buds

47
Q

What is the shape of fungiform papillae?

A

mushroom shaped with taste buds on upper surface

48
Q

Which papillae have taste buds and where?

A

upper surface of fungiform papillae

lateral surface of circumvallate papillae

49
Q

Which papillae do not have taste buds?

A

filliform papillae

50
Q

Where are the fungiform papillae most in number?

A

most numerous at tip of the tongue

51
Q

where are the circumvallate papillae located?

A

located along the sulcus terminalis

52
Q

How many circumvallate papillae exist?

A

approx 7-12

53
Q

What are taste buds?

A

small pale, barrel shaped intraepithelial organs that extend from the basal lamina to the apical surface

54
Q

What are the three cells of the taste buds and their functions?

A

neuroepithelial cells – chemoreceptive
support cells - nutrition
basal cells

55
Q

What is the taste pore?

A

lumen composed of the cells of the taste bud

56
Q

Which cells of the taste buds are innervated?

A

neuroepithelial cells are chemoreceptive and are responsible for sending and receive nerve signals in response to gustatory stimulation

57
Q

What do taste buds do?

A

transduce chemical stimuli into nerve impulses, which the brain perceives as gustatory sensations

Histology (6 decks)

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