|
No.
|
Question
|
Answer
|
|
1
|
Body cavity that
communicates with external surface is lined by a |
Mucous membrane
|
|
2
|
The surface of the oral
cavity is a |
Mucous membrane
|
|
3
|
The classification of oral
mucosa as masticatory, lining and specialized is based on |
Function
|
|
4
|
Areas involved in
mastication and thereby having a masticatory mucosa are |
Gingiva & hard palate
|
|
5
|
The vestibular fornix is
lined by |
Specialized mucosa
|
|
6
|
The mucosa which covers the
buccal musculature is the |
Lining mucosa
|
|
7
|
The mucosa which is bound
to jaw bone is the |
Masticatory mucosa
|
|
8
|
The connective tissue
component of oral mucosa is termed as |
Lamina propria
|
|
9
|
The interface of epithelium
and connective tissue component of oral mucosa is |
Corrugated. This is to
increase the surface area of contact which promotes the adhesion between the epithelium and connective tissue and helps in distribution of the stress epithelium receives. |
|
10
|
The comparable part of oral
mucosa to the dermis of skin is the |
Lamina propria
|
|
11
|
The epithelial projections
in to the connective tissue in oral mucosa are the |
Epithelial reteridges
|
|
12
|
The width of the basement
membrane is |
1-4 micrometers
|
|
13
|
The basement membrane is
stained positively with |
Per Iodic Schiff stain
|
|
14
|
The origin of basal lamina
is |
Epithelium
|
|
15
|
The lamina propria can be
classified as |
Papillary and reticular
|
|
16
|
The reticular layer of
lamina propria has a |
Trellislike arrangement
|
|
17
|
The papillary zone of
lamina propria in oral mucosa is absent/ very small in |
Alveolar mucosa
|
|
18
|
The sublingual tissues are
normally |
Nonkeratinized
|
|
19
|
The intermediate filament
in oral epithelial cells is the |
Keratin
|
|
20
|
The intermediate filament
in oral connective tissue cells is |
Vimentin
|
|
21
|
The intermediate filament
in muscle cells is |
Vimentin
|
|
22
|
The intermediate filaments
of nervous tissue are |
Neural filament
|
|
23
|
All intermediate filaments
are |
7-11nanometer in width
|
|
24
|
The keratinizing oral
epithelium is classified into 4 layers based on |
Morphology
|
|
25
|
A determined
keratinocytes |
Can no longer divide
|
|
26
|
The stratum germinativum
refers to |
Basal & parabasal
spinous layer |
|
27
|
Hemidesmosomes attach
|
Epithelium to basal lamina
|
|
28
|
Below the lamina densa
towards the connective tissue is |
Sublamina densa fibrils
|
|
29
|
The lamina densa is made up
of |
Type IV collagen
|
|
30
|
Based on electron
microscopy the “Intercellular bridges” and “Tonofibrils” of spinous layer of keratinizing epithelium are |
Desmosomes and
tonofilaments |
|
31
|
The tonofilaments seen in
the spinous layer of keratinizing oral epithelium |
Do not cross cells
|
|
32
|
Desmoplakin I and II are
found in |
Desmosomes
|
|
33
|
The oral keratinizing
epithelial layer that has more active protein synthesis is |
Stratum spinosum
|
|
34
|
Basophilic keratohyaline
granules are contained in cells of |
Stratum granulosum
|
|
35
|
Odland body is found
in |
Stratum granulosum
|
|
36
|
Involucrin contributing to
the cornified cell envelope is present in |
Stratum granulosum of
keratinizing epithelium |
|
37
|
The histologically
amorphous layer of oral epithelium is the |
Stratum corneum
|
|
38
|
The largest cell is that
belonging to epithelial layer |
Stratum corneum
|
|
39
|
Of all the mucosal layers,
cells with the largest volume belong to the |
Stratum granulosum
|
|
40
|
The layer which in
comparison to keratinizing epithelium is absent in nonkeratinizing epithelium |
Stratum granulosum
|
|
41
|
In the keratinized masticatory
mucosa, submucosa is absent in the |
Anterolateral fatty zone
|
|
42
|
The oral parts of the
vestigial nasopalatine ducts are contained in |
Incisive papilla
|
|
43
|
The Jacobson’s organ
(vomeronasal organ) in humans |
Disappears after 15th fetal
week |
|
44
|
The width of free gingival
groove in humans is about |
0.5 – 1.5 millimeters
|
|
45
|
The depressions of the
stippling in gingiva correspond to the |
Epithelial ridges
|
|
46
|
With increasing age, the
collagen of gingiva |
Becomes coarser
|
|
47
|
The central concave area of
the gingiva below the contact area is referred as the |
Col
|
|
48
|
The characteristic
morphological feature of the connective tissue papillae of gingiva is that it is |
Long, slender and numerous
|
|
49
|
Mucoperiosteum is a term
referring to attachment of |
Gingiva and periosteum
|
|
50
|
The numerous groups of
gingival fibers are the |
Dentogingival group
|
|
51
|
The color of gingiva is
attributable to |
Keratinization; Thickness
& underlying vascularity; Pigmentation |
|
52
|
Pigmentation in gingiva is
most abundant in the |
Interdental papilla
|
|
53
|
Melanocytes arise from
|
Neural crest
|
|
54
|
Melanin is produced by
|
Melanocytes
|
|
55
|
Merkel cells are
|
Non epithelial
keartinocytes; Neural in origin; Specialized pressure sensitive receptor cells |
|
56
|
The papillae in which taste
buds are lacking are the |
Filiform papillae
|
|
57
|
The least number of
papillae of the tongue are the |
Circumvallate papillae
|
|
58
|
The papilla associated with
von Ebner’s salivary gland is the |
Circumvallate papillae
|
|
59
|
The papilla observed on the
lateral border of the posterior tongue are the |
Foliate papillae
|
|
60
|
The taste bud is barrel
shaped structure the height of which is |
70-80 micrometers
|
|
61
|
The number of taste
receptors per taste bud is |
10 – 12
|
|
62
|
Anchoring filaments which
are very fine filaments that traverse the |
Lamina lucida
|
|
63
|
The collagen that runs
through loops formed by the anchoring fibrils is |
Type III collagen
|
|
64
|
The anchoring fibril
consists of |
Type VII collagen
|
|
65
|
The principal cell in the
lamina propria of the oral mucosa is the |
Fibroblast
|
|
66
|
The siderophage is a
macrophage that ingests |
Hemosiderin
|
|
67
|
Burton’s line is seen in
the gingiva due to |
Lead poisoning
|
|
68
|
Which type of collagen is
present in inflamed tissue |
Type V collagen
|
|
69
|
The fibers are not found in
the oral mucosa |
Oxytalan fibers
|
|
70
|
The fibers that can be
selectively stained with orcein |
Elastic fibers
|
|
71
|
Blood flow through the oral
mucosa is greatest in the |
Gingiva
|
|
72
|
Touch sensation is most
acute in the |
Hard palate
|
|
73
|
The truly specialized
sensory cell in the oral mucosa is the |
Merkel cell
|
|
74
|
With age the oral mucosa
shows increase in the number of |
Collagen fibers
|
|
75
|
The color of oral mucosa
depends on |
Concentration and state of
dilatation of blood vessels; Thickness of epithelium; Degree of Keratinization |
|
76
|
Accumulation of fluid is
most painful in the |
Masticatory mucosa. It is
more tight and bound to the bone with no or little space. Hence it is more painful whereas the lining mucosa is loose. This is the reason while injection of the masticatory mucosa is painful while infection is localized whereas in lining mucosa injections are not painful but infections spread out rapidly. |
|
77
|
In comparison with gastrointestinal
mucosa, oral mucosa does not have |
Muscularis mucosae
|
|
78
|
Mucoperiosteum is devoid
of |
Submucosa. As the submucosa
is absent in the mucoperisteum, it provides firm and inelastic attachment. |
|
79
|
The epithelial progenitor
cells are single layered in |
Floor of mouth. In other
thick mucosa it is up to 3 cell thickness. |
|
80
|
The phase at which the
basal epithelial cells of oral mucosa decide to become a progenitor cell or a differentiated cell is called as |
Dichophase
|
|
81
|
The approximate turnover
rate of oral mucosa is approximately |
25 days. In the gingiva it
is about 41 to 57 days. |
|
82
|
The least differentiated
oral mucosal epithelial cells are the cells of the |
Stratum basale. The most
differentiated cells will be the cells of the stratum corneum especially in the orthokeratinized variant. |
|
83
|
The epithelial component of
the dentogingival junction is from |
Oral mucosal epithelium;
Reduced enamel epithelium; Epithelial cuff |
|
84
|
The Junctional epithelium
of the dentogingival junction is derived from |
Reduced enamel epithelium.
To be more specific it is derived from the outer enamel epithelium. |
|
85
|
Sulcular epithelium of the
dentogingival junction is derived from |
Epithelial cuff
|
|
86
|
The proliferation of outer
enamel epithelium and basal cells of oral mucosal epithelium during eruption of teeth is called as |
Epithelial cuff
|
|
87
|
The greatest number of
papillae per unit area is seen in the |
Masticatory mucosa. It is
so because the masticatory mucosa has to bear a large amount of masticatory force and hence need more surface area to resist and distribute the forces. |
|
88
|
The proteoglycan that coats
the surface of lamina densa is |
Heparan sulfate
|
|
89
|
The glycoprotein that is
involved in adhesion of basal cell surface and basement membrane glycoprotein is the |
Bullous pemphigoid antigen
|
|
90
|
The principal cell in the
lamina propria of the oral mucosa is the |
Fibroblast
|
|
91
|
The principal protein of
the mature fibers of the oral mucosa is |
Elastin
|
|
92
|
Tonofilaments are
|
Intermediate filaments
|
|
93
|
All normal stratified oral
epithelial cells contain |
Cytokeratin 5; Cytokeratin
14; Cytokeratin 15. In addition, cytokeratins-1, 6, 10, 16 are localized to keratinized mucosa and 4, 13 in non-keratinized mucosa. |
|
94
|
Tonofilaments are
aggregated to tonofibrils normally in |
Keratinized mucosa. In non
keratinized mucosa they are dispersed. |
|
95
|
In the upper part of the
prickle cell layer of oral epithelium, an organelle called membrane coating granule is seen that is elongated in |
Keratinized mucosa. In non
keratinized mucosa they are circular. |
|
96
|
Bulk of the keratohylaine
granules are made up of |
Filagrrin
|
|
97
|
Sulphur rich component of
the keratohylaine granule is the |
Loricin
|
|
98
|
The term “Malpighian layer”
contain all layers of oral muocsa include |
Stratum basale; Stratum
spinosum; Stratum granulosum and NOT Stratum corneum |
|
99
|
The layer in the non
keratinized epithelium that is also referred as “stratum distendum” is |
Stratum superficial. It is
due to the fact that it is highly flexible. |
|
100
|
Non-keratinized oral mucosa
lacks |
Filaggrin
|
|
101
|
The most permeable area of
the oral cavity is the |
Floor of the mouth
|
|
102
|
The non-keratinocyte of the
oral epithelium that exhibit desmosomal attachment to adjacent cells is the |
Merkel’s cells
|
|
103
|
The papilla of the oral
mucosa starts to appear in developing human at about |
7th week of intrauterine
life |
|
104
|
The masticatory oral mucosa
before eruption of teeth is usually |
Para keratinized mucosa
|
|
105
|
The separation of primary
attachment epithelium from the enamel of tooth is termed as |
Passive eruption
|
|
106
|
During passive eruption, if
the apical end of attachment of epithelium is in enamel, the stage of passive eruption is |
First stage
|
|
107
|
The clinical crown and
anatomical crown will be the same in |
Third stage of the passive
eruption |
|
108
|
Gingival recession is seen
with |
Fourth stage of passive
eruption. |
|
109
|
A state of passive eruption
that is considered as pathological is when passive eruption is in |
Third stage. 1st and 2nd
stages are considered to be physiological change with age while 3rd and 4th are considered to be pathological at any age. |
|
110
|
Apical shift of the
gingival and trans-septal gingival fibers is seen with |
Second stage of passive
eruption |
|
111
|
Secondary attachment
epithelium of the dentogingival attachment is replaced by |
Gingival epithelium. The
primary attachment epithelium is from reduced enamel epithelium. |
|
112
|
Frenal folds of oral cavity
normally do not have |
Muscle fibers
|
|
113
|
The papilla of the tongue
that is covered by non-keratinized epithelium is |
Fungiform papilla. Filiform
and circumvallate papilla is covered by keratinized epithelium. |
|
114
|
The taste buds in
circumvallate papilla are predominantly found on the |
Lateral walls. In fungiform
and foliate papilla the taste buds are seen in the superior surface. |
|
115
|
The von Ebner salivary
glands are |
A minor serous salivary
gland in association with circumvallate papillae of tongue. Helps in taste sensation. |
Prof. Rooban Thavarajah
Oral and Maxillofacial Pathologist
List