W19/L4 + L10: Skull anatomy Flashcards Preview

6. Neuro > W19/L4 + L10: Skull anatomy > Flashcards

Flashcards in W19/L4 + L10: Skull anatomy Deck (45):
1

What is the upper part of the cranium called

The vault

2

What are the three layers of all of the bones of the skull?

External & internal layers of compact bone, with a middle layer of spongy bone (the diploe)

3

What are the skull sutures?

Immobile joint between the seperate bones

4

Name the four "main" sutures

Coronal
Saggital
Lamboid
Pterion

5

What bones form the coronal suture?

Frontal bone and the 2 parietal bones

6

What bones form the saggital suture?

The two parietal bones

7

What bones form the lambdoid suture?


The two parietal bones and the occipital bone


8

Which two sutures are in the coronal plane?

Coronal & lamboid

9

What bones form the pterion?

Frontal
Parietal
Temporal
Sphenoid

10

What is the significance of the pterion?

The bones are thin at this point, making it a site of weakness

The middle meningeal artery runs directly deep to the pterion

11

What are the 2 parts of the frontal bone?

The vertical part (forehead)

The horizontal part (forming the anterior cranial fossa and roof of the orbit)

12

What is the line of demarcation between the 2 parts of the frontal bone?

The supraorbital margins

13

Describe the parietal bone

Flat, rectangular bone moulded to brain contour

14

Describe the features of the occipital bone

Flat, moulded to posterior aspect of brain

Prominent external occipital protuberance

15

What are the 4 processes of the temporal bone?

Zygomatic
Mastoid
Styloid
Petrous

16

What is the flat "body" of the temporal bone called?

The squamous part

17

Describe the zygomatic process

A thin, forward projection that articulates with the zygomatic bone

18

Describe the mastoid process

A thick, chunky, downwards projection

19

Describe the styloid process

Deep, sharp, downwards projection

20

What structures attach to the styloid process of the temporal bone?

Ones for the oral cavity & pharynx

21

Describe the petrous process of the temporal bone

A chunky, pyramid shaped, inwards projection

22

What are the main features of the sphenoid bone


A body with two wings The body (including sella turcica) has a depression (the hypophysial fossa) for the pituitary gland The superior orbital fissure divides the wings into the lesser (anterosuperior) and greater (posterior) wings


23

What features of the ethmoid bone are visible from inside the cranium?


The cribiform plate, with lots of tiny holes The christa galli


24

What is the only group of foramina in the anterior cranial fossa? And what posses through them?

The holes of the cribiform plate of the ethmoid bone containing the olfactory nerves

25

What's the hypophysial fossa?

The depression in the body of the sphenoid bone where the pituitary sits

26

What are the 6 paired foramina in the middle cranial fossa?

Optic canal

Superior orbital fissure
Foramen rotundum
Foramen ovale
Foramen spinosum
(these 4 form that nice arch)

Foramen lacerum

27

What does the optic canal transmit?

Optic nerve
Opthalmic artery

28

What does the superior orbital fissure transmit?

Nerves for the extra-ocular muscles
V1 of trigeminal
Inferior opthalmic vein

29

What does the F. rotundum transmit?

Maxillary nerve

30

What does the F. ovale transmit?

Mandibular nerve

31

What does the F. spinosum transmit?

Middle meningeal artery

32

What does the F. lacerum transmit?

Nothing! It's covered by a cartilage membrane in living people

33

What are the 4 foramina of the posterior cranial fossa?

Internal acoustic meatus
Jugular foramen
Hypoglossal canal
Foramen magnum

34

What does the int. acoustic meatus transmit?

Facial and vestibulocochlear nerves

35

What does the jugular foramen transmit?

Cranial nerves IX, X, XI
Internal jugular vein

(glossopharyngeal, vagus, accessory)

36

What does the hypoglossal canal transmit?

The hypoglossal nerve

37

Is the jugular foramen a foramen within a bone?

No - it's a deficiency between the petrous process of the temporal bone and it's joint with the occipital bone

38

From what aspect is the hypoglossal canal best seen?

From the inferior aspect, looking up

39

What are the 3 layers of the meninges?

Dura (outer)
Arachnoid (middle)
Pia (inner)

40

What part of the brain does the anterior cranial fossa house?

Frontal lobe

41

What part of the brain does the middle cranial fossa house?

Temporal lobe

42

What part of the brain does the posterior cranial fossa house?

Occipital lobe
Cerebellum

43

What bones form the anterior cranial fossa?

Horizontal plate of the fronal bone
Cribiform plate of ethmoid
Lesser wings of sphenoid

44

What bones form the middle cranial fossa?

Body in greater wings of sphenoid
Petrous part of temporal bone

45

What bones form the posterior cranial fossa?

Petrous part of temporal bone
Occipital bone