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Flashcards in Cranium Deck (220)
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1

The skull is divided into two main sets of bones:

8 cranial bones and 14 facial bones

2

The 8 bones of the cranium are divided into:

the calvarium (skullcap) and the floor. Each consist of four bones.

3

The skullcap consists of which four bones?

Frontal, right parietal, left parietal and occipital

4

The floor of the cranium consists of which four bones?

Right temporal, left temporal, sphenoid, and ethmoid.

5

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

Frontal bone.

6

The squamous portion of any the frontal bone is the ______ portion.

vertical.

7

The orbital portion of the skull is the ______ portion.

horizontal.

8

This is the smooth, raised prominence between the eyebrows just above the bridge of the nose:

Glabella.

9

This is the slight depression above each eyebrow:

The supraorbital groove (SOG).

10

Why is the supraorbital groove an important landmark?

It corresponds to the floor of the anterior fossa of the cranial vault, which is also at the level of the orbital plate or at the highest level of the facial bone mass.

11

The superior rim of each orbit is the :

supraorbital margin (SOM).

12

This is a small hole or opening within the SOM slightly medial to its midpoint:

Supraorbital notch (foramen.).

13

On each side of the squamous portion of the fontal bone above the SOG is a larger, rounded prominence termed the:

Frontal turberosity (eminence).

14

These form the superior part of each orbit:

Orbital plates.

15

Each orbital late is separated from the other by the:

ethmoidal notch.

16

The frontal bone articulates with which four cranial bones?

Right and left parietals, sphenoid, and ethmoid.

17

The lateral walls of the cranium and part of the roof are formed by two:

parietal bones.

18

The widest portion of the entire skull is located between the:

parietal tubercles (eminences) of the two parietal bones.

19

Each parietal bone articulates with these five cranial bones:

frontal, occipital, temporal, sphenoid, and opposite parietal.

20

The inferoposterior portion of the skullcap is formed by:

the single occipital bone.

21

The external surface of the occipital bone presents a rounded part called the:

squamous portion.

22

The squamous portion of the occipital bone forms most of the back of the head and is the part of the occipital bone that is superior to the:

external occipital protuberance, or inion.

23

The large opening at the base of the occipital bone through which the spinal cord passes is called the:

foramen magnum.

24

These oval processes with convex surfaces on each side of the foramen magnum are called the:

occipital condyles

25

The occipital bone articulates with these six bones:

Two parietals, two temporals, sphenoid and atlas.

26

The right and left temporal bones house what?

the delicate organs of hearing and balance.

27

Extending anteriorly from the squamous portion of the temporal bone is an arch of bone termed:

the zygomatic process.

28

____ and _____ have largely replaced conventional radiography for imaging of mastoids and petrous pyramids.

CT and MRI

29

The mastoids and petrous pyramids are locations for organs of:

hearing and equilibrium.

30

The three divisions of the ear are:

External
Middle
Internal