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Flashcards in Skull anatomy Deck (57):
1

What are the two groups of bones that comprise the skull?

Bones of the cranium and bones of the face

2

What is the vault?

Upper cranium

3

What is the upper cranium called?

Vault

4

What is the floor?

Lower cranium/base of skull

5

What is the lower cranium/base of skull called?

Floor

6

Describe the structure of the bones of the skull?

External and internal tables of compact bone
Separated by a layer of spongy bone (ploie)

7

What is the ploie?

Layer of spongy bone that separates the internal and external tables of skull bones

8

List the three major sutures of the skull?

Coronal suture
Sagittal suture
Lambdoid suture

9

Where does the coronal suture run?

Anterior of two sutures in coronal plane
Articulation between frontal and parietal bones

10

Where does the sagittal suture run?

In the sagittal plane, between the left and right parietal bones

11

Where does the lambdoid suture run?

Posterior of sutures in coronal plane
Articulation between parietal and occipital bones

12

Describe the mobility of sutures?

They are immobile joints

13

What is the point where the coronal and sagittal sutures meet called?

Bregma

14

What is the point where the sagittal and lambdoid sutures meet called?

Lambda

15

What is the pterion?

H shaped suture formation on lateral aspect of skull where the frontal, parietal, temporal and sphenoid bones meet

16

Why can a fracture at the pterion be dangerous?

Thin bones at the pterion
Fracture easily
Middle meningeal artery lies here - sharp spike of bone can tear artery

17

What are the two parts of the frontal bone?

Vertical and horizontal

18

What facial structure does the vertical part of the frontal bone correspond to?

Forehead

19

What structure does the horizontal part of the frontal bone contribute to?

Rooves of orbits

20

What is the line of demarcation between the vertical and horizontal parts of the frontal bone called?

Supra-orbital margins

21

What is the supra-orbital margin?

Line of demarcation between the horizontal and vertical parts of the frontal bone

22

Describe the shape of the parietal bone?

Flat and rectangular
Moulded to brain shape

23

Describe the shape of the occipital bone?

Flat
Moulded to the posterior aspect of the brain

24

What is the extra feature on the occipital bone?

External occipital protuberance

25

List the components of the temporal bone?

Squamous part
Zygomatic process
Mastoid process
Styloid process
Petrous part

26

What is the forward projection of the temporal bone?

Zygomatic process

27

Describe the zygomatic process of the temporal bone?

Projection that passes forward to articulate with zygoma

28

What is the posterior projection of the temporal bone?

Mastoid process

29

Describe the mastoid process of the temporal bone?

Posterior projection that is full of air cells

30

What is the inferior projection of the temporal bone?

Styloid process

31

Describe the styloid process of the temporal bone?

Deep, sharp, inferior projection

32

What is the internal projection of the temporal bone?

Petrous part of temporal bone

33

Describe the petrous part of the temporal bone?

Wedge shaped projection
Projects inward into cranium

34

When can the sphenoid bone be seen fully?

When looking at the cranial base from above

35

List the components of the sphenoid bone?

Body
Greater wing
Lesser wing

36

What divides the greater and lesser wings of the sphenoid bone?

Superior orbital fissure

37

What is the sella turcica?

'Turkish saddle'
Depression in body of sphenoid where pituitary gland sits

38

Describe the size and position of the greater and lesser wings of the sphenoid bone?

Greater - large, posteroinferior
Lesser- small, anterosuperior

39

Where does the pituitary gland sit?

In the body of sphenoid

40

Where does the ethmoid bone sit?

Between eyes
(within frontal bone)

41

What facial structures does the ethmoid bone contribute to?

Orbit
Nose

42

Which part of the ethmoid bone can be seen in the cranium?

Cribiform plate

43

What runs through the cribiform plate?

Olfactory nerves

44

What is the crista galli?

Vertical plate of bone that sits up between cribiform plates

45

Describe the initial pathway of the cranial nerves?

Emerge from inferior aspect of brain and exit through foraminae in cranium

46

What are the three fossae in the cranial floor?

Anterior cranial fossa
Middle cranial fossa
Posterior cranial fossa

47

Which part of the brain does the anterior cranial fossa come into contact with?

Supports frontal lobes

48

Which bones make up the anterior cranial fossa?

Horizontal plates of frontal bone with intervening cribiform plate of ethmoid
Lesser wings of sphenoid

49

Which part of the brain does the middle cranial fossa come into contact with?

Supports temporal lobes

50

Which bones make up the middle cranial fossa?

Body and greater wings of sphenoid
Petrous part of temporal bone

51

Which part of the brain does the posterior cranial fossa come into contact with?

Supports occipital lobes and cerebellum

52

Which bones make up the posterior cranial fossa?

Largely occipital bone

53

Which foraminae lie in the anterior cranial fossa?

Cribiform plate

54

Which foraminae lie in the middle cranial fossa?

Optic canal
Superoir orbital fissure
Foramen rotundum
Foramen ovale
Foramen spinosum
(Foramen lacerum)

55

Which foraminae lie in the posterior cranial fossa?

Internal auditory meatus
Jugular foramen
Hypoglossal canal
Foramen magnum

56

Which cranial foraminae communicate with the orbit?

Optic canal
Superior orbital fissure

57

Where does the optic canal lie?

In anterior cranial fossa, between body of sphenoid and lesser wing