Overview Of The Skull

Front 1

what craniometric point lies in the same plane as the orbitomeatal plane (aka)?

Back 1

inion and porion (top of int aud meatus)

orbitomeatal plane = frankfort plane = reid's baseline

Front 2

skullcap aka

Back 2

calvarium

Front 3

how many bones in skull? what kinds? how many each kind? paired, unpaired?

Back 3

Total - 28
t p u
cranial - 8 2 4
facial - 14 6 2
auditory -6 3 0

Front 4

cranial bone means wedge in greek. why?

Back 4

sphenoid

wedged in between all bones - cranial keystone - artic with all other skull bones minus mandible

Front 5

most delicate facial bones?

Back 5

lacrimal

Front 6

these bones are known as the blacksmith's tools.

Back 6

auditory ossicles

Front 7

name all the auditory ossicles

Back 7

malleus incus and stapes
hammer anvil and stirrup

Front 8

this is THE smallest bone in body

Back 8

stapes

Front 9

what are the three smallest bones in body (sm to lrg)

Back 9

1. stapes
2. incus
3. malleus

Front 10

this is the only cranial bone that does not artic with parietal bones

Back 10

ethmoid

Front 11

hardest bone in the body

Back 11

petrous part of the temporal bone

Front 12

if you break through the weakest part of the temporal bone, what artery could you rupture?

Back 12

middle meningeal artery

Front 13

what are the three parts to the temporal bone

Back 13

1. squamous
2. pitromastoid
3. tympanic part

Front 14

where does the ethmoid fit into the frontal bone?

Back 14

ethmoid notch - posteriorly

Front 15

this is the largest unpaired foramen

Back 15

foramen magnum

Front 16

this is the 2nd largest foramen

Back 16

foramen magnum

Front 17

what resides in the formane magnum

Back 17

spin cord and medulla

Front 18

the foramen mag is the same level as

Back 18

hard palate

Front 19

pyramidal shaped bone known as the "egyptian part"

Back 19

petrous part of temporal bone

Front 20

this cartilaginous union between two cranial bones is obliterated by 25 yo.

Back 20

sphenooccipital synchondrosis

Front 21

hyophyseal fossa aka

Back 21

sella turcica

Front 22

slope downwards from sphen to occip

Back 22

clivus

Front 23

bed posts for pituitary gland

Back 23

ant and post cleinoid procss

Front 24

boundary between anerior fossa and mid fossa

Back 24

sphenoidal ridge
ant cleinoid process
limbus

Front 25

limbus vs. jugum?

Back 25

limbus - ridge
jugum - connects two lesser wings

Front 26

this part of skull artic with atlas

Back 26

occipital condyles

Front 27

horizontal joint of fronatl and parietals

Back 27

coronal suture

Front 28

interparietal suture, traveling anteriopostir

Back 28

saggital

Front 29

suture between occiptal and parietals

Back 29

lamdbdoidal suture

Front 30

sutures between squamous portion of temporal bone and parietal

Back 30

squamous suture

Front 31

bones found within sutures are known as? example?

Back 31

wormion bones

incarial bone - in lambdoidal suture

Front 32

what craniometric points are located at these suture junctions

1. saggital - coronal
2. lambdoidal - saggital
3. squamous - lambdoidal
4. squamous-ish -- coronal

Back 32

BLAP
1. bregma
2. lambda
3. asterion
4. pterion

Front 33

what fontanels do you find at BLAP points?

Back 33

bregma - ant fontanel
lambda - post. fontanel
asterion - postero lateral fontanel
pterion - antero lateral fontanel

Front 34

ant fontanelle aka
posteralateral fontan aka

Back 34

sphenoidal fontanel

mastoid fontanel

Front 35

aka mastoid fontanel

Back 35

posterolateral fontanel

Front 36

aka sphenoidal fontanel

Back 36

ant fontanel

Front 37

largest fontanel. when doe sit close? when do others close? shape?

Back 37

1. ant fontanel aka sphen fontanel
2. closes 18 mo after birth
3. 2-3 mo. after birth
4. diamond shape

Front 38

what level is the posterior cranial fossa? the mid c fossa?

Back 38

1. hard palte lvl = for. mag lvl
2. zyg arch level

Front 39

this foramen closes postnatally in frontal bone. where is it?

Back 39

foramen cecum
located anterior to ethmoid in frontal bone

Front 40

what are the 3 most gregarious bones of the body?

Back 40

frontal
sphenoid
ethmoid

Front 41

grooves in anterior fossa are a result of

Back 41

reciprocal contouring aka gyral imprining (from gyral sulci of brain)

Front 42

jugum aka

Back 42

planum

Front 43

along the clivus, if you are less than 25 y/o, you should have a

Back 43

sphenoocciptial synchondrosis - cartilage between the two bonds

Front 44

What does the occipital bone look like before birth?

Back 44

has 4 pieces

1. basioocciput
2. clivus
3. condylar
4. squamous (behind f. mag)

Front 45

what 3 bones artic with both of pariteal bones

Back 45

occipital
frontal
sphenoid

Front 46

what 3 bones artic with both temporal bones

Back 46

occipital
sphenoid
mandible

Front 47

what two bones artic with partners

Back 47

maxilla
parietal

Front 48

post part of inf. concha points to

Back 48

phangeal opning of auditory tube (eust tube)

Front 49

which cranial bone artic with only other crinal bones

Back 49

parietal

Front 50

which skull bone articul with a non skull bone

Back 50

occiiptial - to atlas

Front 51

which skull bone articl with the greatest numb of other bones?

Back 51

ethmoid -13
sphen - 12

Front 52

which cranial bones do not articl with any facial bones

Back 52

occipital
parietal
ethmoid

Front 53

which cranial bone does not articl with parietals

Back 53

ethmoid

Front 54

how many articulations for each cranial bone?

Back 54

Frontal - 12
Spen - 12
eth - 13
occipital - 6
each temporal - 5
each parietal - 5

Front 55

forms boundary btwn mid fossa and post. cran fossa

Back 55

petrosal ridge