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)
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1
Q

What are the 3 component origins of the developing skull?

A

Chondrocranium
Dermatocranium
Splanchnocranium

2
Q

Another name for chondrocranium…

A

basicranium

3
Q

What supports the brain from underneath?

A

chondrocranium/basicranium

4
Q

What kind of bones make dermatocranium?

A

flat bones

5
Q

The splanchnocranium bones were originally derived from…

A

pharyngeal/gill arch elements

6
Q

Endochondral mode of formation means..

A

it has a cartilaginous precursor; it is derived from cartilage

7
Q

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

-Noriega

A

mesodermal

8
Q

Chondrocranium…
Mode of formation:
Germ layer origin:

A

Endochondral

Mesoderm

9
Q

Dermatocranium…
Mode of formation:
Germ layer origin:

A

Dermal

Neural crest

10
Q

Splanchnocranium…
Mode of formation:
Germ layer origin:

A

Endochondral

Neural crest

11
Q

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

A

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

12
Q

Chondrocranium is homologous to…

Why?

A
  • the rest of the axial skeleton

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

13
Q

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

A

chondrocranium

14
Q

Other names for pharyngeal arches:

A

visceral arches

branchial arches

15
Q

What is the first arch?

Second arch?

A
1st = Mandibular arch
2nd = Hyoid arch
16
Q

Eventually the hyoid branch started making a connection to the…

A

braincase

17
Q

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

A

Dermal

In the skin

18
Q

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

A

Foramen magnum

19
Q

The foramen magnum is a hole for the transmission of…

A

nervous tissue

20
Q

Basisphenoid and basioccipital bones are what kind of bones?

A

chondrocranium

21
Q

The roof of the mouth is derived from what bone?

A

chondrocranium

22
Q

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

A

Splanchnocranium

23
Q

The jaw is made of what bone?

A

Splanchnocranium

24
Q

The splanchnocranium of the jaw gets covered with what?

A

dermal bone

25
Q

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

A

quadrate and articular

26
Q

What did the quadrate and articular become?

A

ear ossicles

27
Q

What are the ear ossicles?

A

malleus
incus
stapes

28
Q

Which ear ossicles are remnants of the mandibular arch?

A

malleus and incus

29
Q

Where did the stapes come from?

A

the hyoid arch