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Oral Histology > Ex 2- Formation of Mandible + Temporomandibular Joint (TMJ) > Flashcards

Ex 2- Formation of Mandible + Temporomandibular Joint (TMJ) Flashcards

1
Q

______ _______ are where the initial appearances of bone tissue in the area where each of the ____ bone organs of the body form

A

Ossification Centers

206

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2
Q

Ossification centers appear in different environments within ________ called intramembranous bone organ development or within cartilage model called ________ bone organ development

A

mesenchyme

intramembranous

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3
Q

__ mandible and __ maxillae of the ____ adult skull bone organs

A

1
2
22

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4
Q

The mandible and maxillae have _________ ossification centers

A

intramembraneous

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5
Q

The mandible has __ ossification centers and the ___ maxillary bones have ___ ossification centers per bone

A

2
2
2

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6
Q

Some bones, like the ______ bones have both intramembraneous and endochondrial osssifcation centers and are referred to as having _______ ossification centers

A

temporal

mixed

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7
Q

The number of ossification centers _____ from bone to bone

A

varies

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8
Q

_____ ______ is the site where there is addition of bone tissue to a bone organ

A

growth sites

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9
Q

Growth sites of bone tissue formation include: periosteum, endosteium, haversian + volkman canals and of special interest the ______ ______

A

periodontal ligament (PDL)

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10
Q

No matter what environment _____ ______ forms in or on, it always forms within a highly ______ ______ tissue that is referred to by some as intramembraneous _____ tissue

A

bone tissue
vascularized connective
bone

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11
Q

Paired _______ cartilages one in each _______ process of branchial arch I

A

Meckel’s

mandibular

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12
Q

________ _______serve as the temporary skeleton of mandibular processes of branchial arch I and as a temporary attachment for muscles that eventually attach to the mandible

A

Meckel’s cartilages

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13
Q

Meckel’s cartilages serves as models for and ultimately endochondral ossification centers for 2 ear ossicles : ______ and ______

A

malleus

incus

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14
Q

Meckel’s cartilages serve as the site of appearance of 2 ligaments by undergoing retrogressive changes: ______ ______ and _______

A

anterior mallelar

sphenomandibular

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15
Q

Meckel’s cartilages serve as temporary anterior ______ plate of forming _______ halves

A

lingual

mandibular

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16
Q

Meckel’s cartilages serve as enclosed _____ ______ at the chin end of the mandibular halves

A

growth sites

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17
Q

Meckel’s cartilages undergo growth, mineralization and resorption while serving as anterior _____ ____ and replaced as temporary anterior lingual plates by the encroaching bone tissue of the growing mandible halves

A

growth sites

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18
Q

Meckel’s cartilages serve as both ______ _____ of ear ossicles and as a ______ _____ of each mandible halve

A

ossification centers

growth sites

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19
Q

The enclosed anterior parts of Meckel’s cartilages serve as both ______ _____ ____ of mandibular halves and _____ ____ of the developing mandible halves

A

temporary lingual plate

growth site

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20
Q

The mandible develops as ___ bilateral halves that exist throughout the interuterine period

A

2

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21
Q

The mandible becomes __ of 22 skull bones when osseous union between the halves at the end of the ______ postnatal year

A

1

first

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22
Q

The mandible beings development in the _____ embryonic week from 2 bilateral _______ ______ with mesenchymal tissue _____ to Meckel’s cartilges

A

6th
ossification centers
lateral

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23
Q

The ossification centers of the mandible appear in the area where the _______ ______ ______ branches into the mental and incisive nerves or site of future ______ _______

A

inferior alveolar nerve

mental foramina

24
Q

The mandible grows ______ and ______ from the ossification centers

A

anterior

posterior

25
Q

In the ______ direction the mandible bone incorporates the distal parts of Meckel’s cartilages: this incorporated part of each cartilages becomes the temporary _______ _____ and a _____ _____ for each mandible half

A

anterior
lingual plate
growth site

26
Q

In the _______ direction the mandible bone is in the form of a ____ featuring facial and lingual plates: the posterior end of the facial plate incorporates an independent piece of hyaline cartilage that becomes _______ ________ another ____ _____ of each mandible half

A

posterior
U
condylar cartilage
growth site

27
Q

T/F

Condylar cartilage arises from Meckel’s cartilage

A

False: condylar cartilage is INDEPENDENT of Meckel’s cartilage

28
Q

From each of the ossification centers the bone of the mandible halves grows posterior to the site of future ____ and grows anterior toward the midline of the ____ where the 2 halves approach each other

A

TMJ

chin

29
Q

The proximal end of each Meckel’s cartilage serves as the model for what 2 ear ossicles and 1 ligament?

A

malleus and incus ossicles (bones)

anterior mallelar ligament

30
Q

The middle area of each Meckel’s cartilage serves as the model for what ligament?

A

sphenomandibular ligament

31
Q

The distal end of each Meckel’s cartilages serves as what?

A
  • temporary anterior lingual plate

- growth sites of the mandible halves

32
Q

Meckel’s cartilages serve as a strut of attachment for the muscles of ________

A

mastication ie mylohyoid muscle (medial side) + others

33
Q

________ or _______ are the place of union or junction between 2 or more bones of the skeleton

A

joints or articulations

34
Q

________ joints permit little or no mobility (fibrous + suture joints) ie ________ bones between temporal and parietal bones

A

Synarthrosis

maxillary

35
Q

______ joints permit slight mobility (cartilaginous joins) ie _____ ______

A

Amphiarthrosis

pubic symphysis

36
Q

______ joints permit a variety of movements (synovial joints) ie _________ _______

A 
Diarthrosis
temporomandibular joint (TMJ)
37
Q

________ ______ refers to the TMJs dual compartment structure and function: hinge + sliding movement of mandible

A

Ginglymoarthrodial joint

38
Q

______ ______ is a joint that binds a tooth to a bone socket

A

Gomphosis joint (spike like)

39
Q

______ _____ muscle is the muscles that is attached to the articular disc and response for the hinge and sliding movement of the mandible

A

lateral pterygoid

40
Q

What are the 2 different formation sites of freely movable diarthrodial joints?

A

bone

cartilage

41
Q

What are the 3 features of MOST freely movable joints? Not true for ___

A

1 joint cavity
incomplete articular disc
cartilage articular surfaces
TMJ

42
Q

What are the 2 bones that form the TMJ?

A
  1. temporal - squamous portion

2. mandible- condyloid process (condyle)

43
Q

What are the 3 unique features of the TMJ that make it different from other freely movable joints?

A

2 joint cavities
Complete articular disc
Soft connective tissue articulating surfaces

44
Q

During the ___ embryonic week the blastema or rudiments of TMJ and site of condylar cartilage appear but no ______ is present in this week

A

8th

cavitation

45
Q

The articular disc is present in the ____ embryonic week but ______ occurs during the ______ month in utero

A

8th
cavitation
3rd

46
Q

Hyaline cartilage of the condyle is a ______ ____ of the mandible

A

growth site

47
Q

_______ _______ occurs between the articular connective tissue surface and the condylar cartilage

A

Appositional gwoth

48
Q

Cartilage is mineralized, resorbed and replaced by ______ tissue

A

bone

49
Q

Condylar cartilage remains until about age ____ when it is replaced by _____ bone tissue

A

25

compact

50
Q

The mandible grows ______ and _____

A

downward

forward

51
Q

A person younger than 25 has lots of ______ in the TMJ while an older person does not

A

cells

52
Q

Appearance of 2 ossification centers of the mandible occurs ___ ___ IU, osseous union of mandibular halves occurs at the end of the ___ _____ ____

A

6 wks

1st postnatal year

53
Q

Appearance of the blastema (rudiments) of TMJ occurs ___ ___ IU and cavitation within blastema of TMJ occurs in the ____ _____ IU

A

8wks

3rd month

54
Q

Replacemnt of condylar cartilage by compact bone occurs ____ ____ +/-

A

25 years

55
Q

The _______ is a rudimentary (embryonic) substance from which cells, tissues, or organs are formed

A

blastema

56
Q

The TMJ blastema is where what 4 things form?

A

Condylar cartilage
Articular Disc
2 joint cavities
Soft tissue articular surfaces

Oral Histology (16 decks)

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