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histo 2 > melfi 2 > Flashcards

melfi 2 Flashcards

1
Q

What is an ossification center

A

initial appearance of bone tissue in the area of each of the 206 bones in human body (2 mx, 1 mn)

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2
Q

What is an ossification center within mesenchyme called?

A

intramembranouse bone organ development

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3
Q

What is an ossification center with a cartilage model called?

A

endochondral bone organ development

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4
Q

How many ossification centers are there for the mandible/what type are they

A

intramembranous

2 ossification centers (one for each half)

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5
Q

How many ossification centers are there for the maxilla/what type are they

A

intramembranous

there are 2 maxillary bones
2 centers for each bone

4 total

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6
Q

Where are some places that bone growth can occur? (add bone tissue onto bone organ)

A

periosteum
endosteum
haversian/volkman canals
PDL

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7
Q

What branchial arch does Meckel’s cartilage come from

A

one in each mandibular process of arch I

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8
Q

What are the roles of Meckel’s cartilage (6)

A
  1. Temporary skeleton of mandibular process
  2. Temporary attachment for muscles
  3. Serves as models for malleus and incus
  4. Site of appearance of anterior malleolar and sphenomandibular ligaments
  5. Temporary lingual plate of forming mandible halves
  6. Enclosed growth sites at the chin end of the mandible halves
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9
Q

What ear ossicles does MC serve as a template for

A

malleus and incus

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10
Q

What ligaments originate at MC

A

anterior malleolar

sphenomandibular

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11
Q

What does MC serve as an ossification center for? What does it serve as a growth site for?

A

ossification center for ear ossicles

growth site of each mandible half

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12
Q

What is going on in the enclosed anterior lingual part of MC?

A

temporary lingual plate of mandible halves

growth site of developing mandible halves

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13
Q

When do the two halves of the mandible join

A

end of the first post natal year

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14
Q

When does development of the mandible begin

A

6th embryonic week

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15
Q

Where does development of the mandible arise

A

2 bilateral ossification centers within mesenchymal tissue, LATERAL to MC

intramembranous

centers are located at site of future mental foramina

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16
Q

How does the mandible grow anterior to the ossification center

A

bone incorporates distal parts of MC

this incorporated part becomes temporary lingual plate, growth site of each half

17
Q

How does the mandible grow posterior to the ossification center

A

bone is in a U shape with facial and lingual plates

posterior end of facial plate incorporates independent piece of hyaline cartilage that becomes the condylar cartilage (forming another growth site for each half)

18
Q

Does condylar cartilage arise from MC?

A

NOOO

19
Q

How many skull bones re there

A

22

20
Q

What does the proximal end of MC become

A

malleus and incus bones

anterior mallelar ligament

21
Q

What does the middle area of MC become

A

sphenomandibular ligament

22
Q

What does the distal end of MC become

A

temporary lingual plate

growth sites of mandible halves

23
Q

What area of MC contributes to mandible growth?

A

the distal part (most anterior, like near the chin)

24
Q

Are the mandibular ossification centers lateral or medial to MC

A

lateral

25
Q

What are synarthrosis joints and where are the located

A

little or no mobility (fibrous and suture joints)

between maxillary bones, temporal, parietal

26
Q

What are amphiarthrosis joints and where are the located

A

slight mobility (cartilaginous joints)

pubis symphysis

27
Q

What are diarthrosis joints and where are the located

A

variety of movements (synovial joints)

TMJ

28
Q

What two bones form the TMJ

A

temporal (squamous portion)

mandible (condyle)

29
Q

What are the unique features of the TMJ

A

complete articular disc

two joint cavities

soft connective tissue articulating surfaces

30
Q

What does a normal synovial joint have? (different than TMJ)

A

incomplete disc

one joint cavity

cartilage articular surfaces

31
Q

Is there cavitation of the TMJ in an 8 wk old embryo?

A

no

32
Q

When does cavitation of the articular disc happen

A

third month in utero

33
Q

At what age does the condylar cartilage get replaced by compact bone tissue?

A

25 yrs

34
Q

When do the blastema (rudiments) of the TMJ appear?

A

8th week in utero

35
Q

What does the TMJ blastema form?

A

condylar cartilage
articular disc
two joint cavities
soft tissue articular surfaces

histo 2 (8 decks)

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