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Histology > Oral Cavity > Flashcards

Oral Cavity Flashcards

1
Q

Oral Cavity is bound by

A

hard palate, soft palate, tongue and floor of mouth inferiorly, teeth, oropharynx

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2
Q

Vestibule -

A

area enclosed between lips and teeth

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3
Q

Vermillion Border

A

transitional zone between external haired skin and internal oral mucosa

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4
Q

Color of vermillion border derived from

A

highly vascular dermis and thin, overlying keratinized epidermis

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5
Q

Oral cavity lacks:

A

sweat and sebaceous glands

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6
Q

Oral cavity is highly sensitive due to rich:

A

sensory innervation

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7
Q

Oral cavity responsible for what?

A

ingestion, fragmentation and moistening of food

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8
Q

Masticaiton

A

cutting, chewing, grinding of food by occlusal surfaces of teeth

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9
Q

Mastication is assisted by:

A

lips, tongue, and salivary glands

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10
Q

deglutition is also known as

A

swallowing

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11
Q

Bolus

A

food prepared for swallowing in oral cavity

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12
Q

Oral cavity (other purposes)

A

speech, facial expression, sensory perception & respiration

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13
Q

Anterior 2/3 of tongue consist of a core mass of:

A

skeletal muscle

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14
Q

skeletal muscle in tongue arranged in:

A

3 directions, longitudinal, transverse, oblique

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15
Q

Posterior 1/3 of tongue displays aggregations of

A

lymphatic tissue called lingual tonsils

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16
Q

____ CN involved with tongue

A

5

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17
Q

underside of tongue is

A

ventral surface

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18
Q

Development of tongue:

A

from multiple segments of tissue - from pharyngeal arches equivalent to gills

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19
Q

Dorsal Surface of Tongue is covered by:

A

nonkeratinized stratified squamous epithelium supported by lamina propria associated with muscle core

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20
Q

Oral mucosae (2 kinds)

A

Lining mucosa and Masticatory mucosa

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21
Q

Lining mucosa is:

A

NONkeratinized mucosa found on inner cheeks, floor of mouth, ventral tongue, soft palate

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22
Q

Lining mucosa lacks

A

stratum corneum

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23
Q

Masticatory mucosa is present in areas of high abrasion:

A

gingiva (gums) and hard palate

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24
Q

Masticatory mucosa is:

A

keratinized or parakeratinized

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25
Q

parakeratinized =

A

stratum corneum cells do not lose nuclei

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26
Q

What are the four intrinsic muscles of the tongue? and what cranial nerve supplies them?

A

Superior longitudinal, inferior longitudinal, transversus linguae, verticalis linguae, CN12

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27
Q

The dorsal surface of the tongue contains numerous projections called

A

lingual papillae

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28
Q

Each lingual papilla is formed by a highly vascular connective tissue core and a…

A

covering layer of stratified squamous epithelium

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29
Q

Lingual papillae are divided into four types based on shape:

A

filiform, fungiform, foliate, and cicrumvillae

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30
Q

__________ papillae - most numerous

A

Filiform

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31
Q

Filiform Papillae characterisitics

A

keratinized, short bristles, distributed in parallel rows

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32
Q

Filiform Papillae lack ______, are primarily _____

A

taste buds, tactile

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33
Q

NO ____ core in filiform papillae

A

CT

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34
Q

Fungiform Papillae

A

nonkeratinized stratified squamous epithelium

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35
Q

_____ are along apical surface of fungiform papillae

A

taste buds

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36
Q

Foliate Papillae - characteristics

A

parallel rows, taste buds in lateral wall

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37
Q

Circumvallate Papillae

A

wall like - located in the posterior part of the tongue, aligned in front of the sulcus terminalis

38
Q

the _________ occupies a recess in the mucosa and therefore, surrounded by a circular furrow or trench

A

circumvallate papilla

39
Q

Serous glands in the CT that are in contact with underlying muscle assoc with foliate and circumvallate papilla

A

ebner’s glands

40
Q

Ducts of ebner’s glands open into:

A

floor of the circular furrows

41
Q

Ebner’s glands secrete:

A

lingual lipase and VEGP

42
Q

Von Ebners gland protein undertakes

A

selection binding of sapid (flavorful chemicals) and their transport to taste receptors

43
Q

VEGP,ebnerin bind to

A

taste producing molecules

44
Q

Sides of circumvallate papilla and adjacent wall of furrow contain several

A

taste buds

45
Q

each taste bid consists of __________, its narrow apical end extends into a taste pore

A

50 to 150 cells

46
Q

a taste bud has three cell components:

A

taste receptor,
Supporting cells (immature taste cells) ,
Precursor cells (basal)

47
Q

Taste buds

A

ovoid chemoreceptors

48
Q

taste buds are found in what places

A

fungiform, circumvallate, and foliate papillae, on soft palate, posterior pharynx, and epiglottis

49
Q

taste receptors cells have a life span of

A

10 to 14 days

50
Q

Precursor cells give rise to supporting cells which turn into

A

mature taste receptors

51
Q

basal surface of taste receptor cell makes contact with an

A

afferent nerve terminal derived in sensory ganglia of cranial nerves

52
Q

What cranial nerves supply taste buds

A

CN VII (facial), CN IX (glossopharyngeal) and CN X (vagus)

53
Q

Taste sensations

A

sweet, sour, salty, bitter, umami

54
Q

Umami is from

A

monosodium glutamate

55
Q

Specific taste sensation is generated by

A

specific taste receptor cells

56
Q

Bitter tastes come from:

A

back of tongue - caffeine, morphine, nicotine

57
Q

Umami

A

linked to receptor for L-glutamate and other AA, distribution is unknown

58
Q

Glutamate is naturally found in -

A

meats, cheese, vegetables, signaling intake of proteins and proteinacious foods

59
Q

Umami added to processed foods as

A

MSG

60
Q

Glutamate addition to processed foods to promote food consumption linked to

A

ill and elderly malnutrition

61
Q

Taste perception

A

each tastebud discerns all five tastes but focus on two usually

62
Q

Taste buds on palate register

A

bitter, sour

63
Q

Posterior pharynx and epiglottis taste buds

A

all 5 tastes

64
Q

Receptor cells inside of taste buds respond to single taste modalities and are innervates by

A

individually tuned nerve fibers

65
Q

New modality:

A

Protein CD 36 receptor that specifically responds to flavor of fat

66
Q

CD 36 recognizes fat by:

A

texture

67
Q

CD 36 functions:

A

to facilitate the uptake of fatty acids (mice release fat digesting enzymes and increase intestinal fat absorption)

68
Q

CD 36 can increase preference for

A

fatty foods

69
Q

Saliva sympathetic stimulation

A

inhibits aqueous secretion - thick viscous saliva, rich in protein (mucus)

70
Q

Parasympathetic stimulation

A

copious, watery

71
Q

Saliva contains -

A

water, glycoproteins, and proteins, enzymes (amylase & lysozyme), salivary IgA

72
Q

Salilva is high in ____, low ____, high ______

A

K,Na, bicarbonate

73
Q

average production of saliva is

A

600-1500 ml

74
Q

Proteins in saliva cover teeth with

A

acquired pellicle

75
Q

Salivary Glands

A

distributed throughout submucosa of oral cavity

76
Q

3 major pairs of:

A

parotid, submandibular, and sublingual

77
Q

Parotid:

A

largest gland, located on cheeks - completely serous

78
Q

Parotid Duct:

A

Stenson’s duct, opens within vestibule, opposite upper second molar

79
Q

Submandibular

A

located inferior and medial to ramus of mandible - serous and mucous

80
Q

Submandibular Duct

A

Wharton’s duct, opens at sublingual caruncle

81
Q

Sublingual Gland

A

below tongue, mostly mucous

82
Q

Numerous smaller ______ glands scattered throughout

A

accessory

83
Q

Salivary glands are

A

branched glands

84
Q

secretory unit of salivary gland

A

acinus

85
Q

Myoepithelial cells surround _____ - contraction aids in secretion of _______

A

acini, saliva into ducts

86
Q

Acini are strictly

A

serous of mucous

87
Q

Serous acini of mixed glands often in form of _________

A

demilunes

88
Q

__________ - lined by simple cuboidal epithelium (secrete HCO2, resorb Cl)

A

intercalated ducts

89
Q

Larger ______ - simple cuboidal to columnar epithelium, possess basal striations, due to plasma membrane folding

A

striated ducts

90
Q

Striated ducts function:

A

resorb Na, Sec K, into saliva as well as lysozyme and IgA

91
Q

Striated ducts empty into larger ____________ - stratified cuboidal or pseudostratified columnar epithelium)

A

excretory ducts

Histology (8 decks)

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