EX3; Formation of Mandible and TMJ Flashcards Preview

May14 Oral Histology > EX3; Formation of Mandible and TMJ > Flashcards

Flashcards in EX3; Formation of Mandible and TMJ Deck (47):
1

These are the initial appearances of bone tissue in the area where each of the 206 bone organs of the body form

ossification centers

2

How many ossification centers are in the jaw

2 maxillae (each bone)
2 mandible (each half)

3

In which environments do the ossification centers appear

in mesenchyme
on or within a cartilage model

4

What is the development of an ossification center within mesenchyme called

intramembranous bone organ development

5

What is the development of an ossification center on or within a cartilage model called

endochondral bone organ development

6

True or False
The number os ossification centers varies from bone to bone

True

7

What bones have endochondral ossification centers

ulna
femur

8

True or False
A bone will contain either a endochondral or intramembranous bone organ system, not both

False; some bones, such as the temporal bones, have both
mixed ossification centers

9

This is the location of the addition of bone to a bone organ

growth site

10

The periosteum, endostieum, aversion and volkman canals, and the PDL are all examples of what

growth sites

11

No matter what environment bone tissue from in/on, it always forms within what

a highly vascular connective tissue

12

What is another name for the highly vascular connective tissue that the bone tissue forms in

intramembraneous bone tissue

13

When do the 2 maxillary bones and 2 mandibular halves become one

at the end of the first postnatal year

14

True or False
cartilage is the model for bone and later becomes bone

False; it is resorbed, and does not become bone

15

This serves as the temporary skeleton of mandibular processes of branchial arch 1 and as a temporary attachment for muscles

Meckel's cartilage

16

What two ear ossicles does Meckel's cartilage become (endochondral ossification)

malleus and incus

17

What two ligaments does Meckel's cartilage serve as a site for the appearance of (retrogressive changes)

anterior mallelar and sphenomandibular

18

Meckel's cartilage serves as a temporary anterior lingual plate of the forming what

mandible halves

19

Meckel's cartilage serves as what at the chin end of the mandibular halves

growth sites

20

Meckel's cartilage undergoes growth, mineralization, and respiration while serving as anterior whats and replaced as temporary anterior lingual plates by the encroaching bone tissue of the growing mandible halves

growth sites

21

Meckel's cartialge serve as both ossification centers for what and as growth site of what

ossification center = ear ossicles
growth site = mandibular half

22

In which weeks does the mandible begin development; the appearance of the 2 ossification centers

in the 6th embryonic week

23

Where does the mandible arise from

2 bilateral ossification centers within mesenchymal tissue, lateral to Meckel's cartilage

24

The ossification centers of the mandible appear in the area of where

where the inferior alveolar nerve branches into the mental and incisive nerves or site of future mental foramina

25

In which direction does the bone of the mandible grow

anterior and posterior from the centers

26

in this direction, the bone incorporates the distal parts of Meckel's cartilages; becoming the temporary lingual plate and a growth site for each mandible half

anterior

27

in this direction, the bone is in the from of an "U" featuring facial and lingual plates, it incorporates an independent piece of hyaline cartilage that become the condylar cartilage (another growth site)

posterior

28

True or False
The condylar cartilage arises from Meckel's cartilage

False; it is independent

29

These appear in the 6th embryonic week within the mesenhyme lateral to Meckel's cartilages in the area of the future mental foramen

bilateral ossification centers

30

The proximal end of Meckel's cartilage serves as the model for what

malleus
incus
anterior mallelar ligament

31

The middle area of Meckel's cartilage serves as the model for what

sphenomandibular ligament

32

The distal end of Meckel's cartilage serves as the model for what

temporary anterior lingual plate
growth sites of the mandible halves

33

This is the place of union or junction between two or more bones of the skeleton

joints or articulations

34

This type of joint permits no mobility (fibrous and suture joints); like between maxillary bones

synarthrosis

35

This type of joint permits slight mobility (cartilaginous joint); like pubis symphysis

amphiarthrosis

36

This type of joint permits a variety of movement (synovial joint); like TMJ

diarthrosis

37

This refers to the TMJs dual compartment structure and function

ginglymoarthrodial joint

38

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

gomphosis joint

39

What are the three features of most freely movable joint (like the fetal elbow)

one joint cavity
incomplete articular disc
cartilage articular surfaces

40

What two bones form the TMJ

squamous portion of the temporal bone
condyloid process (condyle) mandible

41

What are the three unique features of the TMJ

complete articular disc
two joint cavities
soft connecting tissue articulating surfaces

42

In which week would you see blastema or rudiments of TMJ and site of condylar cartilage appearance

week 8

43

When does cavitation of the TMJ appear (articular disc)

third month in utero

44

This is a growth site of the mandible

hyaline cartilage of the condyle

45

Appositional growth occurs between what

articular connective tissue surface and the condylar cartilage

46

The condylar cartilage remains until about the age of what, when it is replaced by compact bone tissue

25

47

The TMJ blastema is where what structures will form

condylar cartilage
articular disc
two joint cavities
soft tissue articular surfaces