radiant 3 B

Question 1

2 divisions of skull bones

Answer 1

cranial bones (8)
facial bones (14)

Question 2

cranial bones are divided into 2

Answer 2

• calvarium (skullcap)
• floor

Question 2

calvarium bones and floor bones

Answer 2

CALVARIUM
1. frontal
2. right parietal
3. left parietal
4. occipital

FLOOR
5. right temporal
6. left temporal
7. sphenoid
8. ethmoid

Question 3

This bone contributes to the formation of the forehead and the superior part of each orbit.

Answer 3

frontal bone

Question 4

2 main parts of frontal bone

Answer 4

1. squamous or vertical portion - forms the forehead
2. orbital or horizontal portion - forms the superior part of orbit

Question 5

smooth, raised prominence between the eyebrows just above the bridge of the nose.

Answer 5

glabella

Question 6

slight depression above each eyebrow

Answer 6

supraorbital groove

Question 6

superior rim of each orbit

Answer 6

supraorbital margin

Question 7

larger rounded prominence located on each side of
the squamous portion of the frontal bone above the SOG.

Answer 7

frontal tuberosity (eminence)

Question 7

small hole or opening within the SOM slightly medial to its midpoint. The supraorbital nerve and artery pass through this small opening.

Answer 7

supraorbital notch (foramen)

Question 8

separates the orbital plates from each other. Ethmoid bone fits into this notch.

Answer 8

ethmoidal notch

Question 8

forms the superior part of each orbit. Below the orbital plates lie facial bones, and above the orbital plates is the anterior part of the floor of the brain case.

Answer 8

orbital plate

Question 9

frontal bone articulates with 4 cranial bones

Answer 9

R parietal
L parietal
sphenoid
ethmoid

Question 9

frontal bone articulates with 4 facial bones

Answer 9

two maxillary
two nasal
two zygomatic
two lacrimal

Question 10

lateral walls of the cranium and part of the roof are formed by

Answer 10

parietal bones

Question 10

widest portion of the entire skull is located in?

Answer 10

between parietal tubercles

Question 11

each parietal bone articulates with 5 cranial bones

Answer 11

frontal
temporal
opposite parietal
occipital
sphenoid

Question 12

• rounded part, external surface of the occipital bone
• forms most of the back of the head.

Answer 12

squamous portion

Question 13

prominent bump at the inferoposterior portion of the skull

Answer 13

external occipital protuberance (inion)

Question 13

a large opening at the base of the occipital bone through which the spinal cord passes as it leaves the brain

Answer 13

foramen magnum (great hole)

Question 14

oval processes with convex surfaces, with one on each side of the foramen magnum. These articulate with depressions on the first cervical vertebra, called the atlas.

Answer 14

two lateral condylar portions (occipital condyles)

Question 15

two-part articulation between the skull and the cervical spine.

Answer 15

Atlanta-occipital joint

Question 16

occipital bone articulates with 6 bones

Answer 16

two parietal
sphenoid
two temporal
atlas (c1)

Question 16

Complex structures that house the delicate organs of hearing and balance. It is situated between the greater wing of the sphenoid bone anteriorly and the occipital bone posteriorly.

Answer 16

temporal bones

Question 17

an arch of bone extending anteriorly from the squamous portion of the temporal bone

Answer 17

zygomatic process

Question 17

concave depression that receives the mandibular condyle of the jaw. It is inferior to the zygomatic process and anterior to the EAM.

Answer 17

temporomandibular fossa

Question 18

formed by the articulation of the mandibular condyle with the temoporomandibular fossa.

Answer 18

temporomandibular joint

Question 19

slender bony projection projecting inferior to the mandible and anterior to the EAM.

Answer 19

styloid process

Question 20

3 primary parts of temporal bones

Answer 20

squamous portion mastoid portion petrous portion

Question 20

houses the organs of hearing and equilibrium, including the mastoid air cells. Thickest and densest bone in the cranium.

Answer 20

petrous portion

Question 21

area posterior to the EAM with a prominent mastoid process.

Answer 21

thin upper portion that forms part of the wall of the skull.

Question 22

upper border or ridge of the petrous pyramids. It corresponds to the level of TEA.

Answer 22

petrous ridge (petrous apex)

Question 23

- opening or orifice near the center of the petrous pyramid on the posterior surface just superior to the jugular foramen. - It serves to transmit the nerves of hearing and equilibrium.

Answer 23

internal acoustic meatus

Question 23

each temporal articulates with 3 cranial bones

Answer 23

parietal sphenoid occipital

Question 24

each temporal articulates with 2 facial bones

Answer 24

zygoma mandible

Question 25

It forms the anchor for all eight cranial bones. The central portion of the sphenoid is the body, which lies in the midline of the floor of the cranium and contains the sphenoid sinus.

Answer 25

sphenoid bone

Question 26

- central depression on the body that looks like a saddle from the side. - partially surrounds and protects the hypophysis cerebri or pituitary gland.

Answer 26

sella turcica (Turkish saddle)

Question 27

back of the saddle that is best seen on a lateral view

Answer 27

dorsal sellae

Question 28

shallow depression that begins on the posteroinferior aspect of the dorsum sellae of the sphenoid bone and extends posteriorly to the foramen magnum at the base of the occipital bone.

Answer 28

clivus

Question 29

smaller pair, triangular and are nearly horizontal, ending medially in the two anterior clinoid processes.

Answer 29

lesser wings

Question 30

extend laterally from the sides of the body and form a portion of the floor of the cranium and a portion of the sides of the cranium.

Answer 30

greater wings

Question 31

3 pairs of small openings or foramina in greater wings

Answer 31

foramen rotundum foramen ovale foramen spinosum

Question 32

irregular shaped openings, slightly lateral and posterior to the optic foramina on each side

Answer 32

superior orbital fissures

Question 33

sphenoid articulates with all 7 of other cranial bones

Question 34

sphenoid also articulates with 5 facial bones

Answer 34

R & L palatine R & L zygoma vomer

Question 35

small upper horizontal portion of the bone that contains many small openings or foramina through which segmental branches of the olfactory nerves pass.

Answer 35

cribriform plate

Question 35

It lies primarily below the floor of the cranium

Answer 35

ehtmoid bone

Question 36

projecting superiorly from the cribriform plate.

Answer 36

crista galli (rooster's comb)

Question 36

projecting downward in the midline which helps to form the bony nasal septum.

Answer 36

perpendicular plate

Question 37

- suspended from the undersurface of the cribriform plate on each side of the perpendicular plate. - contain the ethmoid air cells or sinuses and help to form the medial walls of the orbits and the lateral walls of the nasal cavity.

Answer 37

two lateral labyrinths (masses)

Question 38

thin, scroll-shaped projections of bone that extend medially and downward from the medial wall of each labyrinth.

Answer 38

superior and middle nasal conchae (turbinates)

Question 39

ethmoid articulates with 2 cranial bones

Answer 39

frontal sphenoid

Question 39

ethmoid also articulates with 11 facial bones

Answer 39

R & L maxillae R & L nasal bones R & L inferior nasal conchae R & L lacrimal R & L palatines vomer

Question 40

articulations or joints of the cranium

Answer 40

sutures

Question 41

separates frontal from two parietal bones

Answer 41

coronal suture

Question 42

separates two parietal bones in the midline

Answer 42

sagittal suture

Question 43

separates two parietal bones from occipital bone

Answer 43

lambdoidal suture

Question 43

formed by inferior junctions of the two parietal with their respective temporal bones

Answer 43

squamosal sutures

Question 44

anterior fontanel

Answer 44

bregma

Question 45

posterior fontanel

Answer 45

lamba

Question 46

sphenoid fontanel

Answer 46

pterion

Question 46

mastoid fontanel

Answer 46

asterion