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RAD PRO III Crainum > Cranium, Facial Bones, Zygomatic Arches And Orbits > Flashcards

Cranium, Facial Bones, Zygomatic Arches And Orbits Flashcards

1
Q

Smallest bones in the skull

A

Lacrimal bones

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2
Q

What passes through the lacrimal foramen

A

Tear duct

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3
Q

Nasal bones articulate with eachother in what plane

A

Mid sag

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4
Q

Which facial bones have pairs

A

Nasal, lacrimal, maxillary, zygomatic, palatine, inferior nasal conchae

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5
Q

Largest immovable bones of the face

A

Maxillary

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6
Q

Where are lacrimal bones found

A

Anterior part of the medial wall of the orbits between the labyrinth of the ethmoid bone and the maxilla

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7
Q

What X-rays show the lacrimal bones

A

Pa and lateral projections

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8
Q

Where are lacrimal bones found

A

Anterior pard of the medial wall of the orbits between the labyrinth of the ethmoid bone and The maxilla

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9
Q

The alveolar process

A

Thick spongy ridge on the inferior border of maxilla

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10
Q

Each maxilla contains a large

A

Pyramidal cavity called maxillary sinus

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11
Q

Maxillary bones form a pointed forward -projecting process called

A

Anterior nasal spine

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12
Q

Zygomatic bones form the

A

Prominence of the cheeks and part of the side wall and floor of orbital cavities

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13
Q

Nasal conchae are

A

Long, narrow, extremely thin, curl laterally

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14
Q

Small u-shaped bone situated at the base of the tongue

A

Hyoid bone

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15
Q

Sutures are classified by

A

Fibrous joints of the suture type

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16
Q

The atlantooccipital joint is a

A

Synovial ellipsoidal joint

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17
Q

Bones of the orbit

A

Frontal, sphenoid, ethmoid, maxilla, zygoma, lacrimal and palatine

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18
Q

The long axis of the orbit is oblique and forms an angle of what with midsag

A

37 degrees

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19
Q

The superior orbital fissure is the cleft between

A

The greater and lesser wing of the sphenoid bone

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20
Q

Blowout fracture is best seen on what X-ray

A

Pacietoacanthial projection - waters method

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21
Q

Fracture of orbital floor

A

Blowout fracture

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22
Q

Fractures of zygomatic arch

A

Depressed fracture
Tripod fracture - all three sutures

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23
Q

Maxilla fracture

A

Lefort fracture ( I, II, III)

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24
Q

Facial bone fracture is a

A

Visceral cranial fracture

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25
Q

Slowest healing bone in the body

A

Mandible

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26
Q

What projection do you do for a blowout fracture

A

Modified waters

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27
Q

Most frequently fractured facial bone

A

Nasal bone

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28
Q

Lefort I

A

Palate

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29
Q

Blowout fracture is a

A

Orbital floor fracture

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30
Q

Lefort II

A

Nose and palate

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31
Q

Lefort III

A

Entire face

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32
Q

Lefort I : nasomaxillary signs

A

Malocclusion, buccal ecchymosis, epistaxis, maxillary creptius and maxilla mobile

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33
Q

Lefort II: pyramidal - signs

A

Midface crepitus, facial lengthening, bilateral epistaxis,infra orbital parasthesia, ecchymosis

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34
Q

Lefort III: craniofacial disjunction signs

A

Caved in or flattened, lengthened face, csf rhinoronea, bilateral epistaxis

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35
Q

2 bones that form the bony nasal septum

A

Perpendicular plate of ethmoid bone and vomer

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36
Q

Cones of the eyes form an angle of what with msp

A

37 degrees

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37
Q

Cones of the eye form an angle of what with IOML

A

30 degrees

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38
Q

When the orbits are of interest for a Pa Caldwell what is the angle

A

30 degree caudal angle

39
Q

How many facial bones are there

A

14

40
Q

the nasal bones form the

A

bony wall of the nose

41
Q

nasal bones articulate with

A

frontal, ethmoid, and maxillae

42
Q

how many pairs of nasal conchae

A

3

43
Q

which bones form the nasal conchae

A

ethmoid form superior and middle concha and facial bones form inferior concha

44
Q

where are the lacrimal bones located

A

medial wall of each orbit

45
Q

the maxilla bone articulates with all other facial bones except for the

A

mandible

46
Q

the maxilla bone forms part of the

A

lateral walls and most of the floor of the nasal cavity

47
Q

what is located under each orbit and serves as a passage through which the infraorbital nerve and artery reach the nose

A

infraorbital foramen

48
Q

inferior borders of spongy bone that support roots of teeth

A

alveolar process

49
Q

zygomatic bones form the

A

cheekbones, part of the side wall and floor or orbits

50
Q

what extends posteriorly to join the zygomatic process of the temporal bone

A

temporal process

51
Q

palatine bones are composed of

A

2 L shaped bones composed of vertical and horizontal plates

52
Q

which two bones form the hard palate

A

maxilla and palatine

53
Q

vomer is situated in

A

MST of the floor of the nasal cavity

54
Q

the vomer forms the

A

inferior nasal septum

55
Q

the hyoid bone is an

A

accessory bone

56
Q

where is the hyoid bone situated

A

the base of the tongue

57
Q

sutures are what type of joint

A

fibrous immovable

58
Q

how many bones if the orbit formed by

A

7

59
Q

function of orbits

A

protect eyes

60
Q

how are blowout fractures usually imaged

A

CT

61
Q

tripod fracture

A

fracture of the zygomatic arch

62
Q

slowest healing bone in the body

A

mandible

63
Q

lefort fracture

A

maxilla fracture

64
Q

lefort I fracture

A

horizontal fracture of the maxilla

65
Q

Lefort II fracture

A

a pyramid-shaped fracture involving inferior orbital rim

66
Q

lefort III fracture

A

involved seperation of all the facial bones from their cranial base

67
Q

most severe lefort fracture

A

Lefort III

68
Q

what plane is lined up for lateral facial bones

A

IOML parallel

69
Q

why would a 30 degree caudal angle be used for a PA axial caldwell method for facial bones and what is it called

A

to show orbital rims
exaggerated caldwell

70
Q

patient head position for tangential zygomatic arches

A

top of head resting on the board, rotate MSP of head 15 degrees toward side being examined

71
Q

3 point landing for rhese method

A

nose, cheek and chin

72
Q

what angle does MSP form with the IR for these method

A

53 degree angle

73
Q

when the CR is perpendicular where are petrous ridges

A

fill the orbit

74
Q

when the CR has a 15 degree caudal angle where are petrous ridges

A

lower thirds of orbits

75
Q

when CR has 30 caudal angle where are the petrous ridges

A

below the orbits

76
Q

3 bones that form the orbital rim

A

frontal, maxilla and zygoma

77
Q

which bone forms three fourths of the roof of the mouth

A

maxillary bone

78
Q

typical skull

A

mesocephalic

79
Q

skull that is short front to back, broad side to side and shallow vertex to the base

A

brachycephalic

80
Q

Skull that is long front to back, narrow side to side, and deep vertex to base

A

dolichocephalic

81
Q

the petrous pyramids form an average angle of _____ degrees in dolichocephalic

A

40

82
Q

the petrous pyramids lie at an average angle of ___ degrees in the brachycephalic

A

54

83
Q

petrous pyramids project anteriorly and medially at an angle of ___ from the MSP in a mesocephalic skull

A

47

84
Q

cone-shaped, bony-walled cavities situated on each side of the MSP of the head

A

orbits

85
Q

each orbit has a

A

roof, medial wall, lateral wall, and a floor

86
Q

the apex of the orbit corresponds to the

A

optic foramen

87
Q

cleft between the greater and lesser wings of the sphenoid bones

A

superior orbital fissure

88
Q

narrow cleft extending from the lower anterolateral aspect of the sphenoid body anteriorly and laterally between the floor and lateral wall of orbit

A

inferior orbital fissure

89
Q

what parts of the orbits are very fragile

A

floor and walls

90
Q

Rods are used for

A

Night vision and fluoro viewing

91
Q

cones are used for

A

day light and to see color

92
Q

rods or cones cant see color

A

rods

93
Q

rods or cones have high spatial acuity

A

cones

94
Q

for high spatial resolution do you need large or small focal spot

A

small

RAD PRO III Crainum (3 decks)

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