Development of Craniofacial Skeleton

Question 1

Make up of bone

Answer 1

Hydroxyapatite on a collagenous matrix

Question 2

Intramembranous bone is mede from what?

Answer 2

Condensation of mesenchyme

Question 3

Remodeling Def

Answer 3

Growth involving simultaneous deposition and resorption

Question 4

Drift Def

Answer 4

Remodeling that results in movement of a bone

Question 5

Functional Matrix Def

Answer 5

Tissue that guides a bone’s growth by exerting force upon the bone

Question 6

Which way do bones do usually grow in respect to the way that they are depositing matrix?

Answer 6

The opposite way

Question 7

Growth field def

Answer 7

Where matrix can be laid or resorbed

Question 8

Growth Sites

Answer 8

Fields of significance to growth of a bone (ex: mandibular condyle)

Question 9

Growth Centers

Answer 9

Special Growth sites, control overall growth of bone (ex: epiphyseal plates of long bones)

Question 10

Neurocranium def

Answer 10

Brain pan
Two parts:
1) Calvaria
2) Cranial Base

Question 11

Calvaria is aka

Answer 11

Desmocranium

Question 12

Calvaria is made through what process?

Answer 12

IO

Question 13

Calvaria comes from what origin

Answer 13

Paraxial Mesoderm and NC

Question 14

Cranial Base is aka

Answer 14

Chondrocranium

Question 15

Cranial Base is made through what process?

Answer 15

EO

Question 16

Cranial Base comes from what origin?

Answer 16

NC

Question 17

Viscerocraium is what?

Answer 17

Bones of face

Question 18

Origin of viscerocranium

Answer 18

Pharyngeal Arches

Question 19

What portion of the skull grows most postnatally

Answer 19

Viscerocranium

Question 20

The two layers of the calvaria are

Answer 20

Endomeninx

Ectomeninx

Question 21

Endomeninx comes from?

Answer 21

NC

Question 22

ENdomeninx gives rise to?

Answer 22

Pia mater

Arachnoid

Question 23

Ectomeninx comes from?

Answer 23

NC and paraxial mesoderm

Question 24

Ectomeninx gives rise to

Answer 24

Duramater (Inner ectomeninx) and Bone(superficial ectomeninx)

Question 25

Bones in the skull are initially held together by?

Answer 25

Sutures

Question 26

Sutures def

Answer 26

Mesenchymal gaps b/w bones in calvaria

Question 27

Fontanelles def

Answer 27

Un-ossified suture b/w 2 or more skull bones

Question 28

Ossification of sutures marks what?

Answer 28

End of growth

Question 29

Anencephaly Def

Answer 29

Failure of rostral neural tube to close.

Loss of telencephalon

Question 30

Craniosynistosis Def

Answer 30

Premature Fusion of the cranial vault sutures

Question 31

CHondocranium origins

Answer 31

Ectomeninx in floor of brain forms cartilage in response to notochord. This becomes Chondrocranium (later undergoes EO)

Question 32

What embryological tissue forms nasal cavity?

Answer 32

Nasal Capsule

Question 33

Maxilla Proper undergoes this type of ossification

Answer 33

IO

Question 34

origin of maxilla proper

Answer 34

Maxillary prominence

Question 35

Premaxilla undergoes this type of ossification

Answer 35

IO

Question 36

Origin of Premaxilla

Answer 36

Frontonasal process

Question 37

Mandible undergoes this type of ossification

Answer 37

IO

Question 38

Where does the mandible’s bone start to form?

Answer 38

Lateral to Meckel’s Caritlage

Question 39

Does Meckel’s Cartilage become the mandible proper?

Answer 39

Nooo

Question 40

Secondary Accessory cartilages (condylar, coronoid and symphyseal) form from what? and when?

Answer 40

From Meckel’s Cartilage at 14 wks

Question 41

The condylar cartilage undergoes this type of ossification

Answer 41

EO

Question 42

The cartilage of the mandible is primary (meckel’s) or Secondary (derivatives)

Answer 42

Secondary

Question 43

When do the symphyseal cartilages disappear?

Answer 43

Within 1st year

Question 44

When does coronoid cartilage dissapear?

Answer 44

before birth

Question 45

What drives rams growth?

Answer 45

The condylar cartilage. It is its growth center

Question 46

What are the two functions of condylar cartilage?

Answer 46

1) Growth

2) Articulation at TMJ