formation of Mandible and TMJ

Question 1

what is an ossification center

Answer 1

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

Question 2

where do ossification centers form

Answer 2

within mesenchym

on/within cartilage

Question 3

intramembranous bone organ development

Answer 3

when an ossification center begin in the mesenchyme

Question 4

Endochondral bone organ development

Answer 4

When an ossification center begins in the cartilage modl

Question 5

ossification of the mdanible and maxillae

Answer 5

1 mandible

2 maxillae of the 22 adult skull bone organs

Question 6

are the number of ossification centers the same for each bone

Answer 6

Vary from bone to bone

Question 7

ossification centers for the mandible

Answer 7

2 ossification centers (1 for each halve)

Question 8

ossification centers for the 2 maxillary bones

Answer 8

2 ossification centers for each bone

Question 9

what kind of ossification centers does the mandible and maxilla have

Answer 9

intramembranous

Question 10

mixed ossification centers

Answer 10

when both intramembraneous and endochondrial ossification centers

Question 11

GRowth sites

Answer 11

addition of bone tissue to a bone organ

Question 12

what are the growth sites of bone tissue formation

Answer 12

the periosteum
the endosteium
haversian and volkman canals
PDL

Question 13

what does all bone tissue envirnoment have in common

Answer 13

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

Question 14

where is the paired Meckel’s cartialge

Answer 14

One in each mandibular process of branchial arch I

Question 15

skelletal roll of Paired mechel’s cartilage

Answer 15

temporary skeleton of mandibular processes of branchial arch I

Question 16

muscular roll of paired meckel’s cartilage

Answer 16

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

Question 17

what does meckel’s cartilage serve as a model for

Answer 17

Malleus

Incus

Question 18

what ligaments form from the paired meckel’s cartialge

Answer 18

anterior mallelar

Sphenomandibular

Question 19

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

Answer 19

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

Question 20

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

Answer 20

prox: inner ear cavity
Distal: chin

Question 21

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

Answer 21

endochondral ossification centers for the incus and malleus

Question 22

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

Answer 22

undergo retrogressive changes to become the anterior mallelar and sphenomandibular

Question 23

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

Answer 23

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

Question 24

Ossification center and growth sites of MEckel’s cartilage

Answer 24

Ossification centers: ear ossicles

Growth sites: each mandible halve

Question 25

Roll of the enclosed anterior parts of meckel's cartilage

Answer 25

temporary lingual plate of the mandible halves | GRowth site of the developing mandible halves

Question 26

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

Answer 26

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

Question 27

when does the mandible begin development

Answer 27

in the sixth embryonic week

Question 28

what does the mandible arise from

Answer 28

2 bilateral ossification centers within mesenchymal tissue | lateral to meckel's cartialge

Question 29

where do the ossification centers of the mandible arise

Answer 29

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

Question 30

direction of bone growth in the mandible

Answer 30

anterior and posteior

Question 31

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

Answer 31

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

Question 32

what happens to the posterior growth of the manible

Answer 32

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

Question 33

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

Answer 33

incorporates an independent piece of hyaline cartialge to bcome condylar cartilage

Question 34

Condylar cartialge

Answer 34

another growth site of each mandible half

Question 35

Does condylar cartialge arise from meckel's

Answer 35

NOPE

Question 36

what kind of ossification center is the mandibular halves

Answer 36

Intramembranous

Question 37

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

Answer 37

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

Question 38

what does the proximal end of each meckel cartialge become

Answer 38

mdoel for maleus and incus ossicles | Anterior mallelar ligament

Question 39

what does the middle of each meckel cartilage become

Answer 39

sphenomandibular ligament

Question 40

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

Answer 40

temporary anterior lingual plate | growth site of the madnible havles

Question 41

what happens to the distal half of meckel's cartilages

Answer 41

Starts to become enclosed | MC mineralized, resorbed, repalced bone tissue to form the anterior lingual plate of the mandible

Question 42

when does osseus union of the mandible complete

Answer 42

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

Question 43

what are joints/a and articulations

Answer 43

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

Question 44

synarthrosis joint

Answer 44

permits little to no mobility

Question 45

types of synathrosis joint

Answer 45

fibrous and suture joints

Question 46

amphiarthrosis joint

Answer 46

permits slight mobility

Question 47

type of amphiarthrosis joint

Answer 47

cartilaginous joints

Question 48

diarthrosis joints

Answer 48

permits a cariety of movements

Question 49

type of diarthrosis

Answer 49

synovial joints

Question 50

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

Answer 50

synarthrosis

Question 51

what type of joint is between the pubis symphysis

Answer 51

amphiarthrosis

Question 52

what type of joint is the TMJ

Answer 52

Diarthrosis

Question 53

Ginglymoarthrodial joint

Answer 53

dual compartment strucutre and function as ginglymo and arthrodial

Question 54

Joint that binds a tooth to a bone to socket

Answer 54

Gomphosis joint

Question 55

cavity of fetal elbow

Answer 55

1 joint cavity

Question 56

articular disc of fetal elbow

Answer 56

imcomplete articular disk

Question 57

surface of fetal elbow joint

Answer 57

cartilage articular surfaces

Question 58

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

Answer 58

No

Question 59

Bones of the YMJ

Answer 59

temporal (squamous portion) | Mandible (condyloid process)

Question 60

unique features of the TMJ

Answer 60

complete articular disc 2 joint cavities soft connective tissue articulating surfaces

Question 61

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

Answer 61

No cavitation

Question 62

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

Answer 62

articular disk is present but cavitiation is not evident

Question 63

when does cavitation of the TMJ occur

Answer 63

3rd month in utero

Question 64

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

Answer 64

lower joint cavity

Question 65

what is the hyaline cartialge of the condyl

Answer 65

growth site of the mandible

Question 66

where does appositional growth occur in the mandible

Answer 66

between the articular connective tissue surface and the condylar cartialge

Question 67

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

Answer 67

cartilage is mineralized, resorbed and replaced by bone tissue

Question 68

when does the condylar cartilage become replaced

Answer 68

remains until 25 years old then replaced by compact bone tissue

Question 69

what replaces condylar cartialge

Answer 69

compact bone tissue

Question 70

what covers in the conylar compact bone in the Adult TMJ

Answer 70

fibrous articular disc and the soft fibrous connecive tissue

Question 71

when do the 2 ossification centers of the mandible form

Answer 71

6 week IU

Question 72

when does osseous union of mandiular havles occur

Answer 72

end of 1st year

Question 73

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

Answer 73

8th week IU

Question 74

when does cavitiation within blastema of TMJ occur

Answer 74

3rd month IU

Question 75

when is the condylar cartialge replaced by compact bone

Answer 75

25th year

Question 76

what is the blastema

Answer 76

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

Question 77

what does the TMJ blastema from

Answer 77

condylar cartialge articular disc 2 joint cavities soft tissue articualr surfaces

Question 78

what kind of ossification does the mandible and mxila do

Answer 78

intramembranous