Coverings of the CNS

Question 1

Answer 1

Question 2

Answer 2

Question 3

What bones make up the anterior cranial fossa?

Answer 3

Frontal

Ethmoid

Sphenoid

Question 4

Where is the frontal air sinus

Answer 4

The part of the frontal bone that forms the anterior wall of the fossa

Question 5

Crista galli

Answer 5

Sharp ridge on the middle of the anterior cranial fossa that is the point of attachment for the dural falx cerebri

Question 6

What is found either side of the crista galli?

Answer 6

The cribiform plates of the ethmoid which accommodate the olfactory bulbs

Question 7

What bones make up the middle cranial fossa

Answer 7

Sphenoid

Temporal

Question 8

What is found in the middle of the middle cranial fossa?

Answer 8

The hypophyseal fossa which is encompassed by four spurs of bone- the anterior and posterior clinoid processes

Question 9

Contents of the hypophyseal fossa

Answer 9

Pituitary

Question 10

Concetns of the middle cranial fossa lateral to the body of the sphenoid

Answer 10

Temporal lobes of the cerebral hemisphere.

Question 11

Which foramen are found in the middle cranial fossa?

Answer 11

Optic canal

SOF
Foramen rotundum

Ovale

Spinosum

Question 12

Located medial to the anterior clinoid process and communicates with the orbit.

Contains the optic nerve and ophthalmic artery (branch of ICA)

Answer 12

Optic canal

Question 13

Contents of the optic canal

Answer 13

Optic nerve

Ophthalmic artery

Question 14

Lies between the greater and lesser wings of the sphenoid bone and communicates with the orbit.

Carriers III, IV, VI, and V1

Answer 14

SOF

Question 15

Contents of the SOF from superior to inferior

Live Frankly To See Absolutely No Insult

Answer 15

L: lacrimal nerve (branch of CN V1)

F: frontal nerve (branch of CN V1)

T: trochlear nerve (CN IV)

S: superior division of the oculomotor nerve (CN III)

A: abducens nerve (CN VI)

N: nasociliary nerve (branch of CN V1)

I: inferior division of the oculomotor nerve (CN III)

Question 16

Opens into the pterygopalatine fossa and carries the maxillary division of the trigeminal nerve.

Answer 16

Rotundum

Question 17

Foramen of the trigeminal nerve

Standing Room Only

Answer 17

SOF

Rotundum
Ovale

Question 18

Contents of the foramen rotundum

Answer 18

Maxillary division of V

Question 19

Carries the large mandibular division of the trigeminal nerve

Answer 19

Foramen Ovale

Question 20

Contents of the foramen spinosum

Answer 20

Point of entry of the MMA

Question 21

What bones form the posterior fosssa?

Answer 21

Occipital and petrous temporal bones

Question 22

Clivus

Answer 22

Steep, smooth slope in the midline that is continuous with he body of the sphenoid bone.

Brainstem rests upon the clivus

Question 23

Contents of the foramen magnum

Answer 23

Medulla

Admits vertebral arteries and the spinal roots of XI

Question 24

What is found in the lateral wall of the foramen magnum?

Answer 24

Hypoglossal canal through which XII leaves the cranial cavity.

Question 25

Where is the jugular foramen found?

Answer 25

Between the occipital and petrous temporal bones.

Question 26

Contents of the jugular foramen?

Answer 26

IX, X, XI IJV

Question 27

Contents of the internal auditory meatus

Answer 27

VIII VII

Question 28

What is found on the floor of the posterior cranial fossa?

Answer 28

Cerebellum

Question 29

Attachments of the falx cerebri

Answer 29

Anteriorly to the crista galli Posteriorly it becomes continuous with the tentorium cerebelli. Attached to the cranial roof with a free border that lies above the corpus callosum

Question 30

Answer 30

Question 31

Answer 31

Question 32

In what layer is CSF found?

Answer 32

Subarachnoid space

Question 33

What is formed where there are signifiant depressions or fissures in the brain spanned by arcachnoid mater

Answer 33

Subarachnoid cisterns are formed

Question 34

Which are the two particularly large subarachnoid cisterns?

Answer 34

Cisterna magna Interpeduncular cistern

Question 35

Location of the cisterna magna

Answer 35

Between the cerebellum and the dorsal surgace of the medulla. CSF flows into this cistern from the 4th ventricle

Question 36

Location of the interpeduncular cistern

Answer 36

Located at the base of the brain, where the arachnoid spans the space between the two temporal lobes. This cistern contains the optic chiasm. It is deepest between the two cerebellar peduncles of the midbrain.

Question 37

Answer 37