7/21 Part One (Overview of Structure of the Adult Skull) Flashcards Preview

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Flashcards in 7/21 Part One (Overview of Structure of the Adult Skull) Deck (29):
1

What are the 3 component origins of the developing skull?

Chondrocranium
Dermatocranium
Splanchnocranium

2

Another name for chondrocranium...

basicranium

3

What supports the brain from underneath?

chondrocranium/basicranium

4

What kind of bones make dermatocranium?

flat bones

5

The splanchnocranium bones were originally derived from...

pharyngeal/gill arch elements

6

Endochondral mode of formation means..

it has a cartilaginous precursor; it is derived from cartilage

7

"In endochondral formation, it means we usually see the bone is __________ in origin because of the cartilaginous precursor."
-Noriega

mesodermal

8

Chondrocranium...
Mode of formation:
Germ layer origin:

Endochondral
Mesoderm

9

Dermatocranium...
Mode of formation:
Germ layer origin:

Dermal
Neural crest

10

Splanchnocranium...
Mode of formation:
Germ layer origin:

Endochondral
Neural crest

11

Chondrocranium and splanchnocranium both have endochondral modes of formation, but the reason splanchnocranium is derived from neural crest is...

Splanchnocranium has a cartilaginous precursor but it gets COVERED then replaced with dermal bone

12

Chondrocranium is homologous to...
Why?

-the rest of the axial skeleton
-it is derived from mesoderm, just like the axial skeleton (skeleton = somites = mesoderm)

13

What is the "extension" of your vertebrae that forms the base of your skull?

chondrocranium

14

Other names for pharyngeal arches:

visceral arches
branchial arches

15

What is the first arch?
Second arch?

1st = Mandibular arch
2nd = Hyoid arch

16

Eventually the hyoid branch started making a connection to the...

braincase

17

What bone becomes the roof of the skull? Where do they form?

Dermal
In the skin

18

What is the hole where the spinal cord exits to become the spinal column?

Foramen magnum

19

The foramen magnum is a hole for the transmission of...

nervous tissue

20

Basisphenoid and basioccipital bones are what kind of bones?

chondrocranium

21

The roof of the mouth is derived from what bone?

chondrocranium

22

Forming a little bit of the base that holds our brains and also forming a little bit of the walls is derived from...

Splanchnocranium

23

The jaw is made of what bone?

Splanchnocranium

24

The splanchnocranium of the jaw gets covered with what?

dermal bone

25

Before we evolved, what were the "remnants of the mandibular arch"?

quadrate and articular

26

What did the quadrate and articular become?

ear ossicles

27

What are the ear ossicles?

malleus
incus
stapes

28

Which ear ossicles are remnants of the mandibular arch?

malleus and incus

29

Where did the stapes come from?

the hyoid arch