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

EX3; Formation of Mandible and TMJ Flashcards

1
Q

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

A

ossification centers

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2
Q

How many ossification centers are in the jaw

A 
2 maxillae (each bone)
2 mandible (each half)
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3
Q

In which environments do the ossification centers appear

A

in mesenchyme

on or within a cartilage model

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4
Q

What is the development of an ossification center within mesenchyme called

A

intramembranous bone organ development

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5
Q

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

A

endochondral bone organ development

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6
Q

True or False

The number os ossification centers varies from bone to bone

A

True

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7
Q

What bones have endochondral ossification centers

A

ulna

femur

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8
Q

True or False

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

A

False; some bones, such as the temporal bones, have both

mixed ossification centers

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9
Q

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

A

growth site

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10
Q

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

A

growth sites

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11
Q

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

A

a highly vascular connective tissue

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12
Q

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

A

intramembraneous bone tissue

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13
Q

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

A

at the end of the first postnatal year

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14
Q

True or False

cartilage is the model for bone and later becomes bone

A

False; it is resorbed, and does not become bone

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15
Q

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

A

Meckel’s cartilage

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16
Q

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

A

malleus and incus

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17
Q

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

A

anterior mallelar and sphenomandibular

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18
Q

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

A

mandible halves

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19
Q

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

A

growth sites

20
Q

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

A

growth sites

21
Q

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

A

ossification center = ear ossicles

growth site = mandibular half

22
Q

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

A

in the 6th embryonic week

23
Q

Where does the mandible arise from

A

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

24
Q

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

A

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

25
Q

In which direction does the bone of the mandible grow

A

anterior and posterior from the centers

26
Q

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

A

anterior

27
Q

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)

A

posterior

28
Q

True or False

The condylar cartilage arises from Meckel’s cartilage

A

False; it is independent

29
Q

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

A

bilateral ossification centers

30
Q

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

A

malleus
incus
anterior mallelar ligament

31
Q

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

A

sphenomandibular ligament

32
Q

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

A

temporary anterior lingual plate

growth sites of the mandible halves

33
Q

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

A

joints or articulations

34
Q

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

A

synarthrosis

35
Q

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

A

amphiarthrosis

36
Q

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

A

diarthrosis

37
Q

This refers to the TMJs dual compartment structure and function

A

ginglymoarthrodial joint

38
Q

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

A

gomphosis joint

39
Q

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

A

one joint cavity
incomplete articular disc
cartilage articular surfaces

40
Q

What two bones form the TMJ

A 
squamous portion of the temporal bone
condyloid process (condyle) mandible
41
Q

What are the three unique features of the TMJ

A

complete articular disc
two joint cavities
soft connecting tissue articulating surfaces

42
Q

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

A

week 8

43
Q

When does cavitation of the TMJ appear (articular disc)

A

third month in utero

44
Q

This is a growth site of the mandible

A

hyaline cartilage of the condyle

45
Q

Appositional growth occurs between what

A

articular connective tissue surface and the condylar cartilage

46
Q

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

A

25

47
Q

The TMJ blastema is where what structures will form

A

condylar cartilage
articular disc
two joint cavities
soft tissue articular surfaces

I Oral Histology (16 decks)

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