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Histology > Study Files > Flashcards

Study Files Flashcards

1
Q

Junction between primary and secondary dentin is characterized by:

A

Sharp change in direction of dentinal tubules

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2
Q

Odontoblasts arise during time that ameloblasts are in what stage of development

A

Organizing

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3
Q

Dentin is frequently synthesized and calcified as

A

Globular Dentin

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4
Q

Synthesis of dentin begins the ______ stage

A

Late Bell

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5
Q

Dentin synthesis begins _____ and proceeds _____

A

Coronally

Apically

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6
Q

Dentin Matrix contains

A

Type I Collagen, GAGs, glycoproteins

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7
Q

Dentin is derived from ______ only

A

Ectomesenchyme

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8
Q

Peritubular/Intratubular dentin is _____ mineralized than Intertubular dentin

A

More

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9
Q

First formed portion of dentin is

A

Mantle Dentin

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10
Q

Near the DEJ, dentinal tubules may

A

Branch

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11
Q

Canaliculi in dentin are branches of

A

Dentinal Tubules

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12
Q

Tomes’ processes form during _____ stage of Ameloblasts life cycle

A

Formative (?)

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13
Q

Granular layer of Tome’s is found

A

Near cementum

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14
Q

Ameloblasts contain microvilli during _____ stage

A

Maturation

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15
Q

First branchial arch consists of

A

Maxillary and Mandibular prominence

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16
Q

What three components are initially present in each pharyngeal arch

A

Nerve, Cartilage, and artery

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17
Q

Which component of alveolar bone proper is adjacent to cementum

A

Bundle bone (Sharpey’s fibers)

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18
Q

Establishment of foregut and stomatodeum results from _______ of the embryo

A

Cephalic Folding

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19
Q

What is responsible for cephalic folding of embryo

A

Rapid growth of neural tube

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20
Q

Skeletal tissues of facial region are _____ in origin

A

Ectomesenchyme

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21
Q

Anterior 2/3 of tongue develops from

A

Lateral lingual swellings and Tuberculum Impar

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22
Q

The _____ branchial arch doesn’t persist in humans

A

5th

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23
Q

What arises from 3rd Pharyngeal Pouch

A

Inferior Parathyroid Gland

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24
Q

Muscles of mastication and muscles of facial expression are both derived from

A

Mesoderm

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25
Q

Number of roots that are formed is determined by

A

Number of medial ingrowths of cervical loop

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26
Q

What is responsible for lateral folding of embryo

A

Growth of somites

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27
Q

Hypobranchial Eminence is derivative of which pharyngeal arch

A

3rd

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28
Q

Lateral Lingual swellings are derivatives of which pharyngeal arch

A

1st

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29
Q

A cervical sinus may arise from

A

Failure of branchial clefts to fuse completely

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30
Q

_____ lines may be present in bundle bone, appear as basophilic lines in boney matrix, and are found adjacent to Haversian canals

A

Reversal

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31
Q

Palatine Tonsils arise from ____ branchial pouch

A

2nd

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32
Q

Dental Lamina lasts for how long

A

5 years

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33
Q

Neural Crest ectoderm develops from

A

Somites

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34
Q

As the tooth develops the root grows

A

Toward the Oral Epithelium

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35
Q

Which component of enamel organ secretes GAGs

A

Stellate Reticulum

36
Q

*During the evolution of vertebrate jaw the TMJ in amphibians, reptiles and mammal-like reptiles was formed by

A

The Articular and Quadrate bones

37
Q

Dental Organ is a product of

A

Oral Ectoderm

38
Q

What may be responsible for cephalic folding of embryo

A

Rapid growth of neural tube

39
Q

Incremental lines in Dentin are called _____ and Incremental lines in Enamel are called ______

A

Von Ebner

Retzius

40
Q

Enamel Spindles are thought to form

A

Odontoblastic processes penetrating between ameloblasts

41
Q

Oblique fibers resist which movements of tooth

A

Apical

42
Q

Interradicular fibers resist which tooth movements

A

Torquing and Tipping

43
Q

Apical fibers resist which tooth movement

A

Dislocation and Tipping

44
Q

Which two features may be found in both cellular and acellular cementum

A

Sharpey’s fibers

Incremental lines

45
Q

Lines of Von Ebner are _____ to the axis of dentinal tubules

A

Perpendicular

46
Q

Tomes Granular layer is only found in _____

A

Root Dentin

47
Q

______ secrete procollagen peptidase

A

Odontoblasts

48
Q

Secretion of matrix granules and enamel proteins is characteristic of what stage of the ameloblast

A

Formative

49
Q

Which stage of ameloblasts exhibits activity known as modulation

A

Maturation

50
Q

Enamel Rod Sheaths appear different from rest of enamel rod because:

A

Have higher organic content

Have different orientation of hydroxyapatite cyrstals

51
Q

Zone of Weil is found between ____ and ____

A

Odontoblasts

Pulp

52
Q

Epithelial rests of Malessez are separated from PDL by_____

A

Basal Lamina

53
Q

Langerhan cells have _____ receptors

A

IgG

54
Q

Mucoperiosteum is found in

A

Hard Palate and Attached Gingiva

55
Q

Junctional epithelium attaches to enamel by

A

Hemidesmosomes and Basal Lamina

56
Q

Odontoblasts may arise from

A

Monocytes

57
Q

During eruption the Reduced Enamel Epithelium may fuse with

A

Oral Epithelium

58
Q

Salivary gland acini are surrounded by contractile cells called

A

Myoepithelial cells

59
Q

Fibroblasts of PDL are connected to each other by

A

Cell to Cell junctions

60
Q

Free gingiva can be distinguished from attachment epithelium because attachment epithelium

A

Has no rete pegs

61
Q

Calcified remnants of HERS are called

A

Cementicles

62
Q

Dark staining granules of Stratum Granulosum are

A

Keratohyalin types

63
Q

Tonofilaments in keratinocytes are described as

A

Keratin filaments (?)

64
Q

Maxillary sinus is lined by

A

Respiratory epithelium

65
Q

_____ is present in the epithelium lining the maxillary sinus

A

Cilia

66
Q

Which areas are minor salivary glands found

A

Lips, Cheeks, Palate, and Tongue

67
Q

When a tooth first erupts into oral cavity the attachment epithelium is derived from

A

Reduced Enamel Epithelium

68
Q

Number of roots that are formed is determined by

A

Number of medial ingrowths of cervical loop

69
Q

In sulcular epithelium small spaces between cells in stratum spinosum are normally filled with

A

Small amount of fluid

70
Q

Circular fibers are present in ____ and _____ the tooth

A

Free Gingiva

Encircle

71
Q

Continuity of HERS must be broken for what to occur during tooth development

A

Deposition of cementum

72
Q

In salivary glands, folds of the basal portion of cell membrane containing mitochondria are characteristic of

A

Cells of Striated Ducts

73
Q

In the pulp, an increase in age will increase both

A

Number of collagen fibers

Calcification within pulp

74
Q

HERS is characterized by

A

Formation of cell rests in PDL when sheath’s function have been accomplished
Absence of stellate reticululm and stratum intermedium

75
Q

In the embryo, the palate is separated from lip by shallow sulcus in depths of which two epithelial lamina arise; the outer lamina is

A

Vestibular Lamina

76
Q

Thyroid arises from

A

Foramen Caecum

77
Q

Foregut of embryo is lined by

A

Endoderm

78
Q

Primary palate forms from fusion of

A

Medial Nasal Processes

79
Q

Convexities in reversal lines point toward

A

Old Bone

80
Q

Convexities in reversal lines represent

A

Howships lacunae

81
Q

Base of fetal skull is formed by

A

Chondrocranium

82
Q

In a cross-section of crown of tooth, Lines of Retzius appear as

A

Concentric Rings

83
Q

Epithelial Rests of Malessez arise from

A

Cells of HERS

84
Q

Cementum grows by ____ only

A

Apposition

85
Q

IEE can first be identified in

A

Cap Stage

86
Q

Synthesis of dentin begins in the

A

Late Bell Stage

87
Q

Dentin synthesis begins ___ and proceeds _____

A

Coronally, Apically

Histology (16 decks)

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