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Viscera & Visceral Systems > Lecture 23 - Skull and Cranial nerves > Flashcards

Lecture 23 - Skull and Cranial nerves Flashcards

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1
Q

The skull consists of __ bones united at _____

A

22 bones

united at sutures

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2
Q

the facial bones ___ off the cranium

A

hang

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3
Q

What are the conents of the canial cavity?

A

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

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4
Q

The roof of the cranial cavity is the …

A

cranial vault

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5
Q

Where is the sphenoid bone

A

spans across the floor

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6
Q

wher is the ethomoid bone?

A

midline near eye sockets

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7
Q

what are the cheekbones?

A

zygomatic bones

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8
Q

what is the top part of the jaw?

A

maxilla

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9
Q

where is the coronal suture?

A

between frontal and two pariental

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10
Q

the saggital suture is between..

A

the two parietal bones

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11
Q

where is the lambdoidal suture?

A

between two parietal and occipital bones

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12
Q

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

A

3 levels - like a staircase:

  1. anterior cranial fossa
  2. middle cranial fossa
  3. posterior cranial fossa
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13
Q

What are the structures that make the anterior cranial fossa?

A

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)

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14
Q

What are the structures that make the middle cranial fossa?

A

lesser wing ofsphenoid (ant)

petrous portion of temporal bone (posterior)

lateral:
temporal bone
greater wing of sphenoid
pariteal bone

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15
Q

The sphenoid bone forms where? what does it look like

A

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…

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16
Q

What are the structures that make the posterior cranial fossa?

A

petrous portion of temporal bone (ant

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

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17
Q

The cranial nerves supply

A

somatic and visceral motor, autonomic

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18
Q

most cranial nerves arise from the …

A

brainstem

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19
Q

CN1=

A

olfactory

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20
Q

CN2 =

A

optic

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21
Q

CN3 =

A

oculomotor - movement of the eyeballs

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22
Q

CN4 =

A

trochlear - also moving eye balls

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23
Q

CN5 =

A

trigeminal - senesation on face and chewing

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24
Q

CN6 =

Study These Flashcards
A

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

Viscera & Visceral Systems (25 decks)

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