Skull and Cranial Cavity

Question 1

Upper part of cranium?

Answer 1

vault

Question 2

Lower part of cranium?

Answer 2

floor

Question 3

What are the immobilie joints where seperate cranial bones are united?

Answer 3

Sutures

Question 4

What are the cranial bones?

Answer 4

Frontal, temporal, parietal, occipital, sphenoid

Question 5

Name the main sutures uniting the cranial bones?

Answer 5

coronal suture unites the frontal and pareital bones.

saggital suture unites the paired parietal bones.

Lamboid suture unites the occipital and parietal bones.

Pterion suture unites the meeting of the frontal, parietal, temporal and sphenoid bones

Question 6

The pterior has a groove for which important artery?

Answer 6

Middle meningeal artery

Question 7

describe the contours of the frontal bone?

Answer 7

vertical part goes down to superior orbit margins, then turns 90 degrees and goes horizontally going into the orbit and forming the cranial floor.

Question 8

describe contours of parietal bone?

Answer 8

relatively flat, horizontal shaped, and molded to the brains contours.

Question 9

describe occipital bone?

Answer 9

relatively flat, with a bony protuberance that can be felt at the back of the head.

Question 10

describe the temporal bone?

Answer 10

relatively flat, contributes to junction of pteryion.
3 projections of temporal bone:
1.zygomatic process - continuous with cheek bone
2. mastoid process - projecting inferiorly from posterior temporal bone and contributes to muscles of the neck
3. styloid process - positioned medial to zygo and mastoid. sharp, spike appearance.

Question 11

What fissure divides sphenoid bone into greater and lesser wings?

Answer 11

Superior orbital fissure

Question 12

which gland sits in the body of the sphenoid?

Answer 12

pituitary

Question 13

divisions and components of cranial base bones?

Answer 13

Anterior cranial fossa

• horizontal plate of frontal bone
• lesser wing of sphenoid
• cribiform plate

Middle cranial fossa

• greater wing of sphenoid
• petrous part of temporal bone

Posterior cranial fossa
-occipital bone

Question 14

Which cranial fossa contains foramen rotundum, spinosun, and ovale

Answer 14

middle cranial fossa

Question 15

what runs in the optic canal?

Answer 15

optic nerve and ophthalmic artery

Question 16

what sits in the hypophysial fossa?

Answer 16

pituitary gland

Question 17

which nerve runs through the foramen rotundum?

Answer 17

maxillary nerve

Question 18

what nerve runs in the foramen ovale

Answer 18

mandibular nerve

Question 19

what nerves run in the superior orbital fissure?

Answer 19

branches of trigeminal nerve and nerves to extraocular muscles

Question 20

what structure runs in the foramen spinosum?

Answer 20

middle meningeal artery

Question 21

what nerve runs through the cribiform plate?

Answer 21

olfactory nerves

Question 22

what runs through the internal acoustic meatus

Answer 22

facial and vestibulocochlear nerves

Question 23

what runs through the jugular foramen?

Answer 23

cranial nerves 9,10,11 and internal jugular vein

Question 24

what runs through hypoglossal canal?

Answer 24

hypoglossal nerve

Question 25

in which fossa is the foramen magnum located?

Answer 25

posterior fossa

Question 26

in which fossa is the optic canal located?

Answer 26

middle cranial fossa

Question 27

What is cranial nerve 1?

Answer 27

Olfactory

Question 28

cranial nerve II?

Answer 28

optic

Question 29

cranial nerve III?

Answer 29

oculomotor

Question 30

CN IV?

Answer 30

trochlear

Question 31

CN V?

Answer 31

trigeminal

Question 32

CN VI?

Answer 32

abducens

Question 33

CN VII

Answer 33

facial

Question 34

CN VIII?

Answer 34

vestibulocochlear

Question 35

CN IX?

Answer 35

glossopharyngeal

Question 36

CN X?

Answer 36

vagus

Question 37

CN X!

Answer 37

spinal accessory

Question 38

CN XII

Answer 38

hypoglossal

Question 39

which structure prevents rotatory displacement of the brain?

Answer 39

Flax cerebri

Question 40

which structure separates the cerebellum from cebrebral hemisphres

Answer 40

tentorium cerebelli

Question 41

which structures divides right and left cerebellum?

Answer 41

falx cerebelli

Question 42

what are emissary veins?

Answer 42

come from outside of the scalp and drain into the venous sinuses.

Question 43

where is the superior saggital sinus formed

Answer 43

between falx cerebri and skull

Question 44

where is the inferior saggital sinus formed?

Answer 44

along inferior aspect of falx cerebri

Question 45

where is the confluence of sinuses?

Answer 45

at point of junction b/w falx cerebri and tentorium cerebelli. inferior saggital sinus joins with great cerebral vein to become the straight sinus.

Question 46

where is the cavernous sinus?

Answer 46

sits on lateral aspect of body of sphenoid bone

Question 47

in which meningeal space does the middle meningeal artery lie?

Answer 47

extradural space. in the groove of the pteryion. frequently the source cause of extradural hemorrhage.

Question 48

what is the bleed origin of most subdural hematoma’s?

Answer 48

tearing occuring where the cerebral veins enter the superior saggital sinus.