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TMJ Flashcards

1
Q

_______: Initial appearance/s of bone tissue in the area where each of the 206 bone organs of the body form ____________________.

A

ossification centers

1 mandible & 2. maxillae of the 22 adult skull bone organs

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2
Q

Where do ossification centers appear

A

Within mesenchyme called intramembranous bone organ development
or on or within cartilage model (called endochondral bone organ development)

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3
Q

How many ossification centers are found in intramembranous bones?

A

1 mandible has 2 ossification centers

2 maxillary bones have 2 ossification centers

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4
Q

How many ossification centers are found in endochondral bones?

A

in the ulna you will find 3 ossification centers.

Femur: 5 centers

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5
Q

What bone for example has a mixed ossification center? what does that mean?

A

Temporal bones.

It means they have both intramembraneous and endochondrial ossification centers.

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6
Q

A highly vascular connective tissue is referred to by some as ______

A

intramembranous bone tissue (don’t confuse with intramem. ossficiation centers)

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7
Q

one of what is found in each mandibular process of branchial arch 1?

A

paired meckels cartilages

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8
Q

_____ temporary skeleton of mandibular process of branchial arch 1

A

meckels cartilage

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9
Q

Meckles cartilage serve as a temporary attached for ______ that eventually attach to the ______

A

muscles

mandible

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10
Q

Each Meckles cartilage serves as models for 2 ear ossicles: ____ & ____

A

malleus and incus

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11
Q

Each Meckles cartilage serve as site for the appearnace of 2 ligaments:

A

Anterior mallelar and sphenomandibular

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12
Q

_______ serve as temporary ant. lingual plate of forming mandible halves

A

meckles cartilage

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13
Q

Meckles cartilages serve as enclosed _____ at the chin end of the mandible halves

A

growth sites

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14
Q

meckles cartilages serve as both _______ of ear ossicles and as a _____ of each mandible halve

A

ossification centers

growth sites

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15
Q

the mandible develops as:

A

2 bilateral halves that exist throughout the INTERUTERINE period.

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16
Q

The mandible develops 2 bilteral halves that exist throughout the _________ period

A

interuterine period

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17
Q

When does the mandible become one of the 22 skull bones?

A

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

18
Q

What week does the mandible develop?

A

6th embryonic week

19
Q

What/where does the mandible arise from?

A

The mandible arises from 2 bilateral ossification centers that are lateral to meckles cartilages

20
Q

Within what tissue does the mandible arise from?

A

mesenchymal tissue

21
Q

in the mandible: which side of the bone incorporates the distal parts of meckles cartilages.
What does this become?

A

Anterior

It becomes the temporary lingual plate and a growth site of each mandible have.

22
Q

Developing mandible:

_____ side of the bone is in the form of a U featuring what to plates?
What’s unique about one of the plates ^

A

posterior.
featuring facial and lingual plates.
The post end of the facial plate incorporates an INDEPDENT piece of HYALINE cartilage that becomes “condylar cartilage” another growth side of each mandible half.

23
Q

T/F Condylar cartilage arises from meckles cartilage

A

FALSE. It does NOT arise from meckles cartilage. It’s independent.

24
Q

Location of the ossification center of a mnadible half

A

Lateral to meckles cartilage at the site of branching of the mental and incisive nerves from the inferior alveolar nerve: site of future mental foreamen.

25
Q

The condylar cartilage is the enclosed _____ of mandible

A

growth site

26
Q

This is an independent cone that becomes enclosed in the posterior end of the facial bone plate.

A

Condylar cartilage

27
Q

Fate of meckels cartilages

  1. proximal end
  2. Middle area
  3. Distal end.
A
  1. serves as model for 2 ear ossicles and 1 ligament :
    - malleous
    - incus
    - ant. mallelar ligament
  2. Sphenomandibular ligament
  3. Temporary ant. lingual plate & Growth site of mandible halves.
28
Q

Define Joint/articulation

A

The place of union or junction between 2 or more bones of the skeleton

29
Q

Types of joints (3)

A
  1. Synarthrosis
  2. Amphiarthrosis
  3. Diarthrosis
30
Q

Synarthrosis? give example

A

permits little or no mobility (fibrous and suture joints)

Ex: between max. bones: between temporal and paretal bones

31
Q

Amphiarthrosis? Give example

A

Permits slight mobility (cartlagenous joints)

Ex: pubis symphysis

32
Q

Diarthrosis? Give example

A

Permits a lot of movements (synovial joints)

EX: TMJ

33
Q

______ joint binds a tooth to a bone socket

A

Gomphosis joint

34
Q

Ft. Of MOST freely movalbe joints? what’s an exception?

A

One joint cavity
Incomplete articulator disc
Cartilage articular surfaces
EXCEPT TMJ does not have these ft.

35
Q

What two bones form the TMJ?

A

Squamous portion of the temporal bone

and the Condyloid process (condyle) of the mandible

36
Q

Unique ft. Of TMJ?

A

COMPLETE articulator disc
2 joint cavitiies
Soft CT articulating surfaces

37
Q

Blasetma

A

TMJ

38
Q

8 week embryo:

Articular Disc is present but cavitation is not evident; it occurs during the _______

A

3rd month in utero

39
Q

The condylar cartilage remains until what age? and then what is it replaced by?

A

25 and is then replaced by compact bone.

40
Q

Timeline of key events:

  1. Sixth week IU:
  2. End of 1st year
  3. Eighth week IU
  4. Third month IU
  5. 25th year
A
  1. Appearance of 2 ossification centers of mandible
  2. Osseous union of mandibular halves
  3. Appearance of blastema (rudiments) of TMJ
  4. Cavitation within blastema of TMJ
  5. replacement of condylar cartilage by compact bone
41
Q

What forms in the TMJ blasetma?

A
  1. Condylar cartilage
  2. Articular disc
  3. Two joint cavities
  4. Soft tissue articular surfaces

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