Lecture 23 - Skull and Cranial nerves Flashcards Preview

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Flashcards in Lecture 23 - Skull and Cranial nerves Deck (59):
1

The skull consists of __ bones united at _____

22 bones

united at sutures

2

the facial bones ___ off the cranium

hang

3

What are the conents of the canial cavity?

brain, meninges, cranial nerves, arteries, veins, venous sinuses

4

The roof of the cranial cavity is the ...

cranial vault

5

Where is the sphenoid bone

spans across the floor

6

wher is the ethomoid bone?

midline near eye sockets

7

what are the cheekbones?

zygomatic bones

8

what is the top part of the jaw?

maxilla

9

where is the coronal suture?

between frontal and two pariental

10

the saggital suture is between..

the two parietal bones

11

where is the lambdoidal suture?

between two parietal and occipital bones

12

The floor of the cranium has ___ levels, what are they?

3 levels - like a staircase:

1. anterior cranial fossa

2. middle cranial fossa

3. posterior cranial fossa

13

What are the structures that make the anterior cranial fossa?

frontal bone

lesser wing of sphenoid (posteriorly) - important as it has lots of holes for vessels

orbital plates of the frontal bone (floor)
Cribiform plate of ethmoid (floor)

14

What are the structures that make the middle cranial fossa?

lesser wing ofsphenoid (ant)

petrous portion of temporal bone (posterior)

lateral:
temporal bone
greater wing of sphenoid
pariteal bone

15

The sphenoid bone forms where? what does it look like

anterior and middle cranial fossa, is right in the middle of the skull

connects orbits with cranial cavity

looks like a bi-plane - two wings (lesser and greater)

gap b/w the wings behind the eyeballs - BVs can go through here...

16

What are the structures that make the posterior cranial fossa?

petrous portion of temporal bone (ant

floor:
Basilar, condylar and squamous portion of the occipital bone
the mastoid process of the temporal bone

17

The cranial nerves supply

somatic and visceral motor, autonomic

18

most cranial nerves arise from the ...

brainstem

19

CN1=

olfactory

20

CN2 =

optic

21

CN3 =

oculomotor - movement of the eyeballs

22

CN4 =

trochlear - also moving eye balls

23

CN5 =

trigeminal - senesation on face and chewing

24

CN6 =

Abducent - eyeball movement

25

CN7 =

Fascial - smile , move faces

26

CN8 =

Vestibulocochlear - hearing and balance

27

CN9 =

Glossopharyngeal - sensory to throat

28

CN10 =

Vagus - parasympathetic to body

29

CN11 =

Accessory - shrug our shoulders and turn our head

30

CN12 =

Hypoglossal - tounge's move

31

What is the mnemonic for the CNs

oh oh oh to touch and feel very good velvet, AH


Olfactory, Optic, Oculomotor, Trochlear, Trigeminal, Abducent, Facial,
Vestibulocochlear (formerly Auditory), Glossopharyngeal, Vagus, Accessory, Hypoglossal

32

Use your Trigeminal (CN5) nerve and...

masticate!

33

Which nerve are purely sensory?

CN1, CN2, CN8

34

Which nerve are purely motor?

CN3, CN4, CN6, CN11, CN12

35

Which nerve are mixed?

CN5, CN7, CN10

36

where does CN1 exit the skull?

Cribiform plate

37

where does CN2 exit the skull?

optic canal - within the sphenoid bone

38

There are _ extraocular muscles?

6

rectus muscles
sup
inf
medial
lateral

oblique muscles - from the side

39

CN3 goes to all extrocular muscles except..

superior oblique, lateral rectus

40

which cranial nerve goes to the superior oblique extrocular muscle

CN4 - trochlear

41

which cranial nerve goes to the lateral rectus extrocular muscle

CN6 - adjucent

42

where does CN3,4,6 exit the skull?

superior orbital fissure

43

CN3,4,6 are responsible for moving the ...

eyeball

44

What does CN5 do?

somatic sensory +
motor to muscles of mastication

three branches covering the face

45

Where do the branches of CN5 exit the skull?

V1 - superior orbital fissure

v2 - foramen rotundum

v3 - foramen ovale

46

The facial nerve is a ___ nerve

mixed

47

What does CN 7 do?

Motor: muscles of facial expression

visceral efferent : glands eg. lacrimal (tears), sublingual gland

visceral sensory: taste to anterior 2/3 tongue

somatic sensory

48

where does What does CN 7 exit the sckull

internal acoustic meatus

49

what the fascial motor terminal branches ?

pinky to forehead, going down:

temporal
zygomatic
bucal
marginal mandibular
cervical

50

CN8 - what does it do?

Hearing and balance (special sensory)

51

Where does CN8 exit the skull?

internal acoustic meatus

52

CN9 - what does it do?

"does everything"
Glossopharnygeal

"Back of the throat"
sensory from tongue (post. 1/3), pharynx, middle ear and carotid body

taste: post. 1/3 tongue

visceral motor: PS to parotid

motor: stylopharnges

53

Where does CN9 exit the skull?

jugular foramen

54

CN10 - what does it do?

visceral motor

motor to muscles of soft palate, phyarynx, larynx, upper oesophagus and 1 tongue muscle


somatic sensory: pharynx and larynx

visceral sensory: taste, general baro-receptors

55

Where does CN10 exit the skull?

jugular foramen

56

CN11 - what does it do?

provides motor input to sternomastoid and upper part of trapezius

57

Where does CN11 exit the skull?

Spinal acessory

Nucleus is in the upper 5-6 of cervical spinal cord

nerve enters cranium via foramen magnum

then travels with X root and exits jugular foramen

58

CN12 - what does it do?

motor to intrinsic and extrinsic mucles of the tongue - except one, which is dnone by CNX)

59

Where does CN12 exit the skull?

hypoglossal foramen