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Oral Histology Exam II (BLW) > TMJ & Meckel's Cartilage > Flashcards

TMJ & Meckel's Cartilage Flashcards

1
Q

TERM – the initial appearance(s) 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

The ossification centers appear in different 2 environments

1.

2.

A
  1. Within Mesenchyme
  2. Within Cartilage Model
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3
Q

If the ossification center is…

  1. Within mesenchyme –> _________ bone organ development
  2. Within a cartilage model –> __________ bone organ development
A
  1. Intramembranous
  2. Endochondral
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4
Q

True or False?

The number of ossification centers vary from bone to bone

A

TRUE

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5
Q

How many ossification centers in…

  1. Mandible?
  2. Maxilla?
A
  1. Mandible – 2
  2. Maxilla – 4 (2/bone)
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6
Q

The Mandible and Maxilla are examples of _________ bone development

A

Intramembranous

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7
Q

The ulna and femur are examples of ______ bone organ development

A

Endochondral

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8
Q

Some bones such as the _________ ______ have both intramembranous and endochondrial ossification centers and are referred to as having “_____ _____ _____”

A

Temporal Bones

Mixed Ossification Centers

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9
Q

TERM – The addition of bone tissue to a bone organ

A

Growth Sites

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10
Q

The following are examples of ______ _______

  1. Periosteum
  2. Endosteium
  3. Haversian/Volkman Canals
  4. PDL
A

Growth Sites

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11
Q

No matter what environment bone tissue forms in or on, it always forms within a highly ______connective tisssue which is referred to as intramembranous bone tissue formation (not OSS. Centers!)

A

Vascular

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12
Q

Paired Meckels Cartilages:

  1. Temporary skeleton of ______ processes of BA 1
  2. Temporary attachment for _______ that will attach to mandible eventually
  3. Each cartilage serves as models for the 2 ear ossicles:

____ & _____

  1. Each serve as a site for the appearance of 2 ligaments

_____ & _____

  1. Serve as temporary ______-_____ plate of the forming mandible halves
  2. Serve enclosed ______ _____ at the chin end of the mandible halves
A
  1. Temporary skeleton of mandibular processes of BA 1
  2. Temporary attachment for muscles that will attach to mandible eventually
  3. Each cartilage serves as models for the 2 ear ossicles:

Malleus & Incus

  1. Each serve as a site for the appearance of 2 ligaments

Anterior Mallelar and Sphenomandibular

  1. Serve as temporary anterior-lingual plate of the forming mandible halves
  2. Serve enclosed growth sites at the chin end of the mandible halves
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13
Q

Fate of Meckel’s Cartilage…

From the proximal (inner ear) –> distal (chin)… each cartilage serves as sites for:

A
  1. Endochondral Ossification Centers for 2 ear ossicles
  2. Undergo retrogressive changes becoming 2 ligaments
  3. Undergo growth, mineralization, and resorption while serving as anterior growth sites and replaced as temporary anterior lingual plates by encroaching bone tissue of the growing mandible halves
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14
Q

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

A

Ossification Centers

Growth Site

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15
Q

The enclosed anterior parts of Meckel’s cartilages serve as

1.

2.

A
  1. Temporary Lingual Plate of mandible halves
  2. Growth Site of Developing mandible halves
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16
Q

The mandible is ____ of ____ total skull bones

A

1

22

17
Q

The mandible develops as 2 bilateral halves tha exist throughout the ________ period. Union occurs at the end of the ______ ______ _____

A

Interuterine

First Postnatal Year

18
Q
  1. At what week does the mandible begin to develop?

–> bilateral ossification centers specifically

  1. What growth environment?
A
  1. 6th

Same as tooth development!

  1. Menenchymal (intramembranous)
19
Q

The ossification centers of the mandible first appear in the area of the future _______ _______

A

future mental foramina

(Where IA branches to mental and incisive nerves)

20
Q

Anterior Growth of Mandible:

  1. Incorporates the ____ parts of Meckel’s cartilage
  2. Becomes temporary ______ ______ & growth site of each mandible half
A
  1. distal
  2. lingual plate
21
Q

Posterior Growth of Mandible:

  1. Bone is in the form of a ‘U’ featuring ____ & ____ plates
  2. Posterior end of the _______ plate incorperates an independednt piece of hyaline cartilage that becomes ______ _______ and also another growth site for each mandible half
A
  1. facial and lingual
  2. Facial, condylar cartilage
22
Q

True or False?

The condylar cartilage does NOT arise from Meckel’s cartilage

A

True

23
Q

The mandible grows

  • posteriorly towards :
  • anteriorly towards :
A
  • TMJ
  • midline of the chin
24
Q

Fate of Meckel’s Cartilage

1. Proximal

2. Middle

3. Distal

A
  1. Malleus & Incus ossicles, anterior mallelar ligament
  2. Sphenomandibular ligament
  3. temporary anterior lingual plate & growth sites of the mandible halves
25
Q

TERM – Joint that permits little or no mobility (fibrous & suture joints)

A

Synarthrosis

ex: maxillary bones

26
Q

TERM – Joint that permits slight mobility (cartilagenous joints)

A

Amphiarthrosis

ex: pubis symphysis

27
Q

TERM – Joint that permits a variety of movements (synovial joint)

A

Diarthrosis

ex: temporomandibular joint

28
Q

TERM – Joint that refers to its dual compartment structure and function: Ginglymo and Arthrodial

A

Ginglyomoarthrodial Joint

29
Q

TERM – Joint that binds a tooth to a bone socket

A

Gomphosis

30
Q

A freely moveable joint will usually consist of 3 components

1.

2.

3.

EXCEPT FOR THE TMJ

A
  1. One joint Cavity
  2. Incomplete Articular Disc
  3. Cartilage Articular Surfaces
31
Q

What two bones form the TMJ?

A
  1. Temporal bone (squamous portion)
  2. Mandible (condyloid process)
32
Q

The components of the freely moveable TMJ are:

A
  1. Complete Articular Disc
  2. Two joint cavities
  3. Soft Connective Tissue Articulating Surfaces
33
Q

Another name for rudiments of TMJ (cells, tissuues, organs formed)

A

Blastema

34
Q

When does the TMJ cavitation occur?

A

3rd month in utero

35
Q

The articular disk is present at ____ week in utero

A

6th

36
Q

What type of growth occurs between the articular connective tissue surface and the condylar cartilage?

A

Appositional

37
Q

The condylar cartilage remains until about the age of _____, then it is replaced by _______ bone tissue.

A

25

Compact bone tissue

38
Q

The TMJ blastema is where what 4 things form

1.

2.

3.

4.

A
  1. Condylar Cartilage
  2. Articular Disc
  3. Two Joint Cavities
  4. Soft Tissue Articular Surfaces
39
Q

True or False?

The osseous union of the mandible halves occur at the 8th week

A

FALSE

Occurs at the end of teh 1st year

Oral Histology Exam II (BLW) (7 decks)

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