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oral histology > formation of Mandible and TMJ > Flashcards

formation of Mandible and TMJ Flashcards

1
Q

what is an ossification center

A

the intial appearance of bone tissue in the area where each of the 206 bone organs of the body form

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2
Q

where do ossification centers form

A

within mesenchym

on/within cartilage

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3
Q

intramembranous bone organ development

A

when an ossification center begin in the mesenchyme

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4
Q

Endochondral bone organ development

A

When an ossification center begins in the cartilage modl

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5
Q

ossification of the mdanible and maxillae

A

1 mandible

2 maxillae of the 22 adult skull bone organs

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6
Q

are the number of ossification centers the same for each bone

A

Vary from bone to bone

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7
Q

ossification centers for the mandible

A

2 ossification centers (1 for each halve)

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8
Q

ossification centers for the 2 maxillary bones

A

2 ossification centers for each bone

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9
Q

what kind of ossification centers does the mandible and maxilla have

A

intramembranous

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10
Q

mixed ossification centers

A

when both intramembraneous and endochondrial ossification centers

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11
Q

GRowth sites

A

addition of bone tissue to a bone organ

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12
Q

what are the growth sites of bone tissue formation

A

the periosteum
the endosteium
haversian and volkman canals
PDL

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13
Q

what does all bone tissue envirnoment have in common

A

always forms within a highly vascular connective tissue refered to as intramembranous bone tissue (not to be confused with intramembrane ossification ceneters)

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14
Q

where is the paired Meckel’s cartialge

A

One in each mandibular process of branchial arch I

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15
Q

skelletal roll of Paired mechel’s cartilage

A

temporary skeleton of mandibular processes of branchial arch I

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16
Q

muscular roll of paired meckel’s cartilage

A

serve as temporary attachment for muscles that eventually attach to the mandible

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17
Q

what does meckel’s cartilage serve as a model for

A

Malleus

Incus

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18
Q

what ligaments form from the paired meckel’s cartialge

A

anterior mallelar

Sphenomandibular

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19
Q

what does the Meckel’s cartialge do for the mandibular halves

A

serve as temporary antetrior lingual plate of the mandible halves
serve as enclosed growth sites at the chin end of the mandible halves

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20
Q

the proximal and distal parts of the paired meckel’s cartilage

A

prox: inner ear cavity
Distal: chin

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21
Q

what happens to the proximal end of paired meckel’s cartilage

A

endochondral ossification centers for the incus and malleus

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22
Q

what happens to the middle portion of paired meckel’s cartilage

A

undergo retrogressive changes to become the anterior mallelar and sphenomandibular

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23
Q

what happens to the distal portion of paired meckel’s cartialge

A

undergo growth, mineralization, and resporption while serving as anterior growth sites
replaces as temporary anterioer lingual plates by encroaching bone tissues oft he mandible halves

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24
Q

Ossification center and growth sites of MEckel’s cartilage

A

Ossification centers: ear ossicles

Growth sites: each mandible halve

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25
Q

Roll of the enclosed anterior parts of meckel’s cartilage

A

temporary lingual plate of the mandible halves

GRowth site of the developing mandible halves

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26
Q

when does the mandible go from 2 bilateral halves to 1 bone

A

when osseous union occures between the halves at the end of the first postnatal year

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27
Q

when does the mandible begin development

A

in the sixth embryonic week

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28
Q

what does the mandible arise from

A

2 bilateral ossification centers within mesenchymal tissue

lateral to meckel’s cartialge

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29
Q

where do the ossification centers of the mandible arise

A

appear in the area where the inferior alveolar nerve branches into the mental and incisive nerve (site of the muture mental foramina

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30
Q

direction of bone growth in the mandible

A

anterior and posteior

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31
Q

antior growth of the mandible does what to meckel’s cartialge

A

incorporativees the distal parts of meckel’s cartialges to bceome the temporary lingual plate and a growth site of each mandible halves

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32
Q

what happens to the posterior growth of the manible

A

the bone is in the form of a U featuring facial and lingual plates

33
Q

what happens to the posterior end of the facial plate of the manible

A

incorporates an independent piece of hyaline cartialge to bcome condylar cartilage

34
Q

Condylar cartialge

A

another growth site of each mandible half

35
Q

Does condylar cartialge arise from meckel’s

A

NOPE

36
Q

what kind of ossification center is the mandibular halves

A

Intramembranous

37
Q

what do the incorporated distal ends of meckel’s cartilage serves as

A

Temporary anterior lingual plates and growth sites of the forming mandible halves

38
Q

what does the proximal end of each meckel cartialge become

A

mdoel for maleus and incus ossicles

Anterior mallelar ligament

39
Q

what does the middle of each meckel cartilage become

A

sphenomandibular ligament

40
Q

what does the distal end of the meckel’s cartialge become

A

temporary anterior lingual plate

growth site of the madnible havles

41
Q

what happens to the distal half of meckel’s cartilages

A

Starts to become enclosed

MC mineralized, resorbed, repalced bone tissue to form the anterior lingual plate of the mandible

42
Q

when does osseus union of the mandible complete

A

at the end of the first year (suture disappears - remodeled to become 1 bone)

43
Q

what are joints/a and articulations

A

the plcae of union/junctions between 2 or more bones of the skeleton

44
Q

synarthrosis joint

A

permits little to no mobility

45
Q

types of synathrosis joint

A

fibrous and suture joints

46
Q

amphiarthrosis joint

A

permits slight mobility

47
Q

type of amphiarthrosis joint

A

cartilaginous joints

48
Q

diarthrosis joints

A

permits a cariety of movements

49
Q

type of diarthrosis

A

synovial joints

50
Q

what types of joint is between maxilary bones or temporal and paretal bones

A

synarthrosis

51
Q

what type of joint is between the pubis symphysis

A

amphiarthrosis

52
Q

what type of joint is the TMJ

A

Diarthrosis

53
Q

Ginglymoarthrodial joint

A

dual compartment strucutre and function as ginglymo and arthrodial

54
Q

Joint that binds a tooth to a bone to socket

A

Gomphosis joint

55
Q

cavity of fetal elbow

A

1 joint cavity

56
Q

articular disc of fetal elbow

A

imcomplete articular disk

57
Q

surface of fetal elbow joint

A

cartilage articular surfaces

58
Q

do features of most free moveing joints(elbow) apply to the TMJ

A

No

59
Q

Bones of the YMJ

A

temporal (squamous portion)

Mandible (condyloid process)

60
Q

unique features of the TMJ

A

complete articular disc
2 joint cavities
soft connective tissue articulating surfaces

61
Q

cavitiation of the TMJ in the Blastema area at 8 week embryo

A

No cavitation

62
Q

articular disk of the blastema area of the TMJ in the 8 week embryo

A

articular disk is present but cavitiation is not evident

63
Q

when does cavitation of the TMJ occur

A

3rd month in utero

64
Q

what part of the joint cavity cavitates frist at 3 months IU

A

lower joint cavity

65
Q

what is the hyaline cartialge of the condyl

A

growth site of the mandible

66
Q

where does appositional growth occur in the mandible

A

between the articular connective tissue surface and the condylar cartialge

67
Q

what happens at the lower end of the hyaline cartialge of the condyle

A

cartilage is mineralized, resorbed and replaced by bone tissue

68
Q

when does the condylar cartilage become replaced

A

remains until 25 years old then replaced by compact bone tissue

69
Q

what replaces condylar cartialge

A

compact bone tissue

70
Q

what covers in the conylar compact bone in the Adult TMJ

A

fibrous articular disc and the soft fibrous connecive tissue

71
Q

when do the 2 ossification centers of the mandible form

A

6 week IU

72
Q

when does osseous union of mandiular havles occur

A

end of 1st year

73
Q

what does the appearance of blastema (rudiments) of the TMJ occur

A

8th week IU

74
Q

when does cavitiation within blastema of TMJ occur

A

3rd month IU

75
Q

when is the condylar cartialge replaced by compact bone

A

25th year

76
Q

what is the blastema

A

rudimentary (embryonic) substance from which cells, tissues, or organs are formed

77
Q

what does the TMJ blastema from

A

condylar cartialge
articular disc
2 joint cavities
soft tissue articualr surfaces

78
Q

what kind of ossification does the mandible and mxila do

A

intramembranous

oral histology (14 decks)

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